PORTIBM PC Portable (uses same BIOS as XT) 01F0-01F7 - HDC 1 (1st Fixed Disk Controller) (ISA(Industry-Standard Architecture) The expansion bus used by the IBMInternational Busiuness Machines PCIBM PC/ATIBM PC AT. See also EISA., EISA(Enhanced Industry-Standard Architecture) A 32-bit superset of the IBMInternational Busiuness Machines ATIBM PC AT's expansion bus (which is now known as the ISA or Industry-Standard Architecture bus).) Range: 01F0-01F7 for primary controller, 0170-0177 for secondary controller SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 0170h-0177h,PORTIBM PC Portable (uses same BIOS as XT) 3510h-3513h 01F0 RW data register 01F1 R- error register (see #P0512) 01F1 -W WPC/4 (Write Precompensation CylinderThe set of concentric tracks of data located at the same position on each data-bearing surface of the disk. A double-sided floppy will contain two tracks per cylinder. divided by 4) 01F2 RW sector count 01F3 RW sector number (CHS mode) logical block address, bits 0-7 (LBA mode) 01F4 RW cylinder low (CHS mode) logical block address, bits 15-8 (LBA mode) 01F5 RW cylinder high (CHS mode) logical block address, bits 23-16 (LBA mode) 01F6 RW drive/head (see #P0513) 01F7 R- status register (see #P0514) 01F7 -W command register (see #P0515) Bitfields for Hard Disk Controller error register: Bit(s) Description (Table P0512) ---diagnostic mode errors--- 7 which drive failed (0 = master, 1 = slave) 6-3 reserved 2-0 error code 001 no error detected 010 formatter device error 011 sector buffer error 100 ECC circuitry error 101 controlling microprocessor error ---operation mode--- 7 bad block detected 6 uncorrectable ECC error 5 reserved 4 ID found 3 reserved 2 command aborted prematurely 1 track 000 not found 0 DAM not found (always 0 for CP-3022) SeeAlso: #P0513,#P0514 Bitfields for hard disk controller drive/head specifier: Bit(s) Description (Table P0513) 7 =1 6 LBA mode enabled, rather than default CHS mode 5 =1 4 drive select (0 = drive 0, 1 = drive 1) 3-0 head select bits (CHS mode) logical block address, bits 27-24 (LBA mode) SeeAlso: #P0512,#P0514 Bitfields for hard disk controller status register: Bit(s) Description (Table P0514) 7 controller is executing a command 6 drive is ready 5 write fault 4 seek complete 3 sector buffer requires servicing 2 disk data read successfully corrected 1 index - set to 1 each disk revolution 0 previous command ended in an error SeeAlso: #P0512,#P0515 (Table P0515) Values for hard disk controller command codes: Command Spec Type Proto Description class: 00h opt nondata NOP 08h device reset 1xh opt nondata recalibrate 1 20h req PIOin read sectors with retry 1 21h req PIOin read sectors without retry 1 22h req PIOin read long with retry 1 23h req PIOin read long without retry 1 30h req PIOout write sectors with retry 2 31h req PIOout write sectors without retry 2 32h req PIOout write long with retry 2 33h req PIOout write long without retry 2 3Ch IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt PIOout write verify 3 40h req nondata read verify sectors with retry 1 41h req nondata read verify sectors without retry 1 50h req vend format track 2 7xh req nondata seek 1 8xh IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. vendor vend vendor unique 3 90h req nondata execute drive diagnostics 1 91h req nondata initialize drive parameters 1 92h opt PIOout download microcode 94h E0h IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt nondata standby immediate 1 95h E1h IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt nondata idle immediate 1 96h E2h IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt nondata standby 1 97h E3h IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt nondata idle 1 98h E5h IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt nondata check power mode 1 99h E6h IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt nondata set sleep mode 1 9Ah IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. vendor vend vendor unique 1 A0h ATAPI packet command A1h ATAPI opt PIOin ATAPI Identify (see #P0524) B0h SMART opt Self Mon., Analysis, Rept. Tech. (see #P0527) C0h-C3h IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. vendor vend vendor unique 2 C4h IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt PIOin read multiple 1 C5h IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt PIOout write multiple 3 C6h IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt nondata set multiple mode 1 C7h ATA-4 Read DMAsee Direct Memory Access O/Q C8h IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt DMAsee Direct Memory Access read DMAsee Direct Memory Access with retry 1 C9h IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt DMAsee Direct Memory Access read DMAsee Direct Memory Access without retry 1 CAh IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt DMAsee Direct Memory Access write DMAsee Direct Memory Access with retry 3 CBh IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt DMAsee Direct Memory Access write DMAsee Direct Memory Access w/out retry 3 CCh ATA-4 Write DMAsee Direct Memory Access O/Q DAh get media status DBh ATA-2 opt vend acknowledge media chng [Removable] DCh ATA-2 opt vend BootTo start up the computer or operating system. The term "boot" is a contraction of "bootstrap", which in turn comes from the expression "to lift oneself by one's boot straps." The ROM BIOS on IBMInternational Busiuness Machines PCs and compatibles reads in the first sector of the disk, which contains a short (less than 500 bytes) program that reads in a portion of the operating system, which in turn reads in the remainder of the operating system. See also IPL. / Post-Boot [Removable] DDh ATA-2 opt vend BootTo start up the computer or operating system. The term "boot" is a contraction of "bootstrap", which in turn comes from the expression "to lift oneself by one's boot straps." The ROM BIOS on IBMInternational Busiuness Machines PCs and compatibles reads in the first sector of the disk, which contains a short (less than 500 bytes) program that reads in a portion of the operating system, which in turn reads in the remainder of the operating system. See also IPL. / Pre-Boot (ATA-2) [Removable] DEh ATA-2 opt vend door lock [Removable] DFh ATA-2 opt vend door unlock [Removable] E0h-E3h (second half of commands 94h-96h) E4h IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt PIOin read buffer 1 E5h-E6h (second half of commands 98h-99h) E8h IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt PIOout write buffer 2 E9h IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt PIOout write same 3 EAh ATA-3 opt Secure Disable [Security Mode] EAh ATA-3 opt Secure Lock [Security Mode] EAh ATA-3 opt Secure State [Security Mode] EAh ATA-3 opt Secure Enable WriteProt [Security Mode] EBh ATA-3 opt Secure Enable [Security Mode] EBh ATA-3 opt Secure Unlock [Security Mode] ECh IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. req PIOin identify drive 1 (see #P0516) EDh ATA-2 opt nondata media eject [Removable] EEh ATA-3 opt identify device DMAsee Direct Memory Access (see #P0516) EFh IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. opt nondata set features 1 (see #P0535) F0h-F4h IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. vend EATA standard F1h Security Set Password F2h Security Unlock F3h Security Erase Prepare F4h Security Erase Unit F5h-FFh IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. vendor vend vendor unique 4 F5h Security Freeze Lock F6h Security Disable Password SeeAlso: #P0512,#P0514 Format of IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI./ATA Identify Drive information: Offset Size Description (Table P0516) 00h WORD general configuration (see #P0517) 02h WORD number of logical cylinders 04h WORD reserved 06h WORD number of logical heads 08h WORD vendor-specific (obsolete: unformatted bytes per track) 0Ah WORD vendor-specific (obsolete: unformatted bytes per sector) 0Ch WORD number of logical sectors 0Eh WORD vendor-specific 10h WORD vendor-specific 12h WORD vendor-specific 14h 10 WORDs serial number no serial number if first word is 0000h else blank-padded ASCII serial number 28h WORD vendor-specific [buffer type: 01h single-sector, 02h multisector, 03h multisector with read cache] 2Ah WORD controller buffer size in 512-byte sectors 0000h = unspecified 2Ch WORD number of vendor-specific (usually ECC) bytes on Read/Write Long; 0000h = unspecified 2Eh 4 WORDs firmware revision no revision number if first word is 0000h else blank-padded ASCII revision number 36h 20 WORDs model number no model number if first word is 0000h else blank-padded ASCII model string 5Eh WORD read/write multiple support bits 7-0: maximum number of sectors per block supported 00h if read/write multiple not supported bits 15-8: vendor-specified 60h WORD able to do doubleword transfers if nonzero 62h WORD capabilities (see #P0518) 64h WORD security mode bit 15: security-mode feature set supported bits 14-8: maximum number of passwords supported 66h WORD PIO data transfer cycle timing 68h WORD single-word DMAsee Direct Memory Access data transfer cycle timing 6Ah WORD field validity bit 0: offsets 6Ch-75h valid bit 1: offsets 80h-8Dh valid 6Ch WORD logical cylinders in current translation mode 6Eh WORD logical heads in current translation mode 70h WORD logical sectors per track in current translation mode 72h DWORDDoubleword; four bytes. Commonly used to hold a 32-bit segment:offset or selector:offset address. current capacity in sectors (excluding device-specific uses) 76h WORD multiple-sector support bits 7-0: count for read/write multiple command bit 8: multiple-sector setting is valid 78h DWORDDoubleword; four bytes. Commonly used to hold a 32-bit segment:offset or selector:offset address. total number of user-addressable sectors (LBA mode) 00000000h if LBA mode not supported 7Ch WORD single-word DMAsee Direct Memory Access transfer modes low byte is bitmap of supported modes (bit 0 = mode 0, etc.) high bytes is bitmap of active mode (bit 8 = mode 0, etc.) 7Eh WORD multiword DMAsee Direct Memory Access transfer low byte is bitmap of supported modes (bit 0 = mode 0, etc.) high byte is bitmap of active mode (bit 8 = mode 0, etc.) 80h WORD supported flow control PIO transfer modes 82h WORD minimum multiword DMAsee Direct Memory Access transfer cycle time in ns 84h WORD recommended multiword DMAsee Direct Memory Access cycle time in ns 86h WORD minimum non-flow-control PIO transfer cycle time in ns 88h WORD minimum PIO transfer cycle time with IORDY in ns 8Ah 2 WORDs reserved for future PIO modes (0) 8Eh 2 WORDs reserved (0) 92h WORD command queueing/overlapped operation (see #P0523) 94h 6 WORDs reserved (0) A0h WORD major revision number of specification to which device conforms 01h = ATA-1, 02h = ATA-2, etc. 0000h/FFFFh = not reported A2h WORD minor revision number of specification to which device conforms 0000h/FFFFh = not reported A4h WORD feature set support 1 (see #P0519) (only valid if revision reported in A0h/A2h) A6h WORD feature set support 2 (see #P0520) (only valid if revision reported in A0h/A2h) A8h WORD (ATA/ATAPI-4) feature set support extension (see #P0521) AAh WORD feature set enabled 1 (see #P0522) (only valid if revision reported in A0h/A2h) ACh WORD feature set enabled 2 (see #P0520) (only valid if revision reported in A0h/A2h) AEh WORD (ATA/ATAPI-4) feature set enabled extension (see #P0521) B0h 42 WORDs reserved (0) 100h 32 WORDs vendor-specific 100h WORD security status 140h 96 WORDs reserved (0) SeeAlso: #P0524,#00267 Bitfields for IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. general configuration: Bit(s) Description (Table P0517) 15 device class =0 ATA device =1 ATAPI device 14 requires format speed tolerance gap 13 supports track offset option 12 supports data strobe offset 11 disk rotational sped tolerance > 0.5% 10-8 disk transfer rate 001 <= 5Mbit/sec 010 5-10 Mbit/sec 100 > 10Mbit/sec 7-6 drive type 01 fixed media 10 removable media 5 synchronized drive motor option enabled 4 head-switching time > 15 microseconds 3 encoding =0 MFM(Modified Frequency Modulation) A method of encoding data as a series of magnetic flux reversals on disk or tape, commonly known as double-density recording. In contrast to FM, modified frequency modulation omits all clock pulses except those between pairs of zero bits. See also FM, RLL. 2-1 sector type 01 hard-sectored 10 soft-sectored 0 unused (0) SeeAlso: #P0516 Bitfields for IDE(Integrated Drive Electronics) A type of disk drive interface which essentially extends the PCIBM PC's expansion bus all the way to the drive and places the drive controller on the disk drive itself. See also ESDI. capabilities: Bit(s) Description (Table P0518) 13 Standby Timer values used according to ATA standard 11 IORDY supported 10 device can disable use of IORDY 9 LBA mode supported 8 DMAsee Direct Memory Access supported SeeAlso: #P0516 Bitfields for ATA feature set support 1: Bit(s) Description (Table P0519) 15 Identify Device DMAsee Direct Memory Access command is supported 14 NOP (00h) command is supported 13 Read Buffer command is supported 12 Write Buffer command is supported 11 Write Verify command is supported 10 host protected area feature set is supported 9 Device Reset (08h) command is supported 8 Service interrupt is supported 7 release interrupt is supported 6 device supports look-ahead 5 device supports write cache 4 PACKET command feature set is supported 3 power management is supported 2 removable-media feature set is supported 1 security feature set is supported 0 SMART feature set is supported Note: values of 0000h and FFFFh indicate that this field is not supported SeeAlso: #P0516,#P0520,#P0521 Bitfields for ATA feature set support/enabled 2: Bit(s) Description (Table P0520) 15 must be 0 if this field is supported 14 must be 1 if this field is supported 13-2 reserved 1 Read DMAsee Direct Memory Access O/Q (C7h) and Write DMAsee Direct Memory Access O/Q (CCh) commands supported/enabled 0 Download Microcode (92h) command is supported/enabled SeeAlso: #P0516,#P0522,#P0519,#P0521 Bitfields for ATA feature set support extension: Bit(s) Description (Table P0521) 15 must be 0 if this field is supported 14 must be 1 if this field is supported 13-0 reserved SeeAlso: #P0516,#P0519,#P0520 Bitfields for ATA feature set enabled 1: Bit(s) Description (Table P0522) 15 Identify Device DMAsee Direct Memory Access command is supported 14 NOP (00h) command is supported 13 Read Buffer command is supported 12 Write Buffer command is supported 11 Write Verify command is supported 10 host protected area feature set is supported 9 Device Reset (08h) command is supported 8 Service interrupt is enabled 7 release interrupt is enabled 6 look-ahead is enabled 5 write cache is enabled 4 PACKET command feature set is enabled 3 power management is enabled 2 removable-media feature set is enabled 1 security feature set is enabled 0 SMART feature set is enabled SeeAlso: #P0516,#P0520 Bitfields for ATA/ATAPI-4 command queueing/overlapped operation support: Bit(s) Description (Table P0523) 15 reserved 14 device supports command queueing 13 device supports overlapped operation 12-5 reserved 4-0 maximum depth of queued commands supported (0 if bit 14 clear) SeeAlso: #P0516 Format of ATAPI Identify Information: Offset Size Description (Table P0524) 00h WORD general configuration (see #P0525) 02h 9 WORDs ??? 14h 10 WORDs serial number no serial number if first word is 0000h else blank-padded ASCII serial number 28h 3 WORDs vendor-specific 2Eh 4 WORDs firmware revision no revision number if first word is 0000h else blank-padded ASCII revision number 36h 20 WORDs model number no model number if first word is 0000h else blank-padded ASCII model string 5Eh WORD vendor-specific 60h WORD reserved (0) 62h WORD capabilities (see #P0518) 64h WORD security mode??? 66h WORD PIO data transfer cycle timing 68h WORD single-word DMAsee Direct Memory Access data transfer cycle timing 6Ah WORD field validity bit 0: offsets 6Ch-73h valid bit 1: offsets 80h-8Dh valid 6Ch WORD ??? logical cylinders in current translation mode 6Eh WORD ??? logical heads in current translation mode 70h WORD ??? logical sectors per track in current translation mode 72h 2 WORDs ??? current capacity in sectors 76h WORD ??? multiple-sector count for read/write multiple command 78h 2 WORDs ??? total number of user-addressable sectors (LBA mode) 7Ch WORD single-word DMAsee Direct Memory Access transfer modes low byte is bitmap of supported modes (bit 0 = mode 0, etc.) high bytes is bitmap of active mode (bit 8 = mode 0, etc.) 7Eh WORD multiword DMAsee Direct Memory Access transfer low byte is bitmap of supported modes (bit 0 = mode 0, etc.) high bytes is bitmap of active mode (bit 8 = mode 0, etc.) 80h WORD supported flow control PIO transfer modes 82h WORD minimum multiword DMAsee Direct Memory Access transfer cycle time 84h WORD recommended multiword DMAsee Direct Memory Access cycle time 86h WORD minimum non-flow-control PIO transfer cycle time 88h WORD minimum PIO transfer cycle time with IORDY 8Ah 2 WORDs reserved for future PIO modes (0) 8Eh WORD typical time for release when processing overlapped CMD in microseconds 90h WORD ??? 92h WORD major ATAPI version number 94h WORD minor ATAPI version number 96h 54 WORDs reserved (0) 100h 32 WORDs vendor-specific 140h 96 WORDs reserved (0) SeeAlso: #P0516 Bitfields for ATAPI General Configuration: Bit(s) Description (Table P0525) 15-14 device type 0x not ATAPI 10 ATAPI 11 reserved 13 reserved 12 device present (non-ATAPI) 12-8 ATAPI device type (see #P0526) 7 device is removable 6-5 CMD DMAsee Direct Memory Access Request type 00 microprocessor DRQ 01 interrupt DRQ 10 accelerated DRQ 11 reserved 4-2 reserved 1-0 CMD packet size (00 = 12 bytes, 01 = 16 bytes) SeeAlso: #P0524 (Table P0526) Values for ATAPI device type: 00h direct-access device (i.e. disk drive) 01h sequential-access device (i.e. tape drive) 02h printer 03h processor 04h write-once device 05h CD-ROM 06h scanner 07h optical memory 08h medium changer 09h communications device 0Ah reserved for ACS IT8 0Bh reserved for ACS IT8 0Ch array controller device (i.e. RAID) 0Dh-1Eh reserved 1Fh unknown type or no device SeeAlso: #P0525 (Table P0527) Values for Self-Monitoring, Analysis, Reporting Technology (SMART) subcommand: D0h Read Attribute Values (optional) (see #P0529) results returned in 512-byte sector read from controller D1h Read Attribute Thresholds (optional) (see #P0528) results returned in 512-byte sector read from controller D2h Disable Attribute Autosave (optional) sector-count register set to 0000h D2h Enable Attribute Autosave sector-count register set to 00F1h D3h Save Attribute Values (optional) D4h execute off-line tests immediately (optional) D5h-D6h reserved D7h vendor-specific D8h Enable SMART Operations D9h Disable SMART Operations DAh Return SMART Status if any threshold(s) exceeded, CylinderLow set to F4h and CylinderHigh set to 2Ch DBh Enable/Disable Automatic Off-Line Data Collection sector-count register set to 0000h to disable, 00F8h to enable DCh-DFh reserved E0h-EFh vendor-specific Note: to access SMART commands, the CylinderThe set of concentric tracks of data located at the same position on each data-bearing surface of the disk. A double-sided floppy will contain two tracks per cylinder. Low register must be set to 004Fh and the CylinderThe set of concentric tracks of data located at the same position on each data-bearing surface of the disk. A double-sided floppy will contain two tracks per cylinder. High register must be set to 00C2h before invoking the SMART command with the SMART command number in the Features register SeeAlso: #P0515 Format of S.M.A.R.T. attribute thresholds sector: Offset Size Description (Table P0528) 00h WORD data structure revision number (0005h for SMART Revision 2.0) 02h 12 BYTEs attribute threshold data 1 (see #P0531) ... 14Eh 12 BYTEs attribute threshold data 30 (see #P0531) 16Ah 18 BYTEs reserved (0) 17Ch 131 BYTEs vendor-specific 1FFh BYTE checksum (two's complement of eight-bit sum of first 511 bytes) Note: if the drive provides fewer than 30 attributes, all remaining attribute records are filled with NUL (00h) bytes SeeAlso: #P0527,#P0529 Format of S.M.A.R.T. attribute values sector: Offset Size Description (Table P0529) 00h WORD 02h 12 BYTEs attribute value data 1 (see #P0532) ... 14Eh 12 BYTEs attribute value data 30 (see #P0532) 16Ah BYTE off-line data collection status (see #P0533) 16Bh BYTE vendor-specific 16Ch WORD time to complete off-line data collection, in seconds 0001h-FFFFh 16Eh BYTE vendor-sepcific 16Fh BYTE off-line data collection capability (see #P0534) 170h WORD S.M.A.R.T. capabilities (see #P0530) 172h 16 BYTEs reserved (0) 182h 125 BYTEs vendor-specific 1FFh BYTE checksum (two's complement of eight-bit sum of first 511 bytes) Note: if the drive provides fewer than 30 attributes, all remaining attribute records are filled with NUL (00h) bytes SeeAlso: #P0527,#P0528 Bitfields for S.M.A.R.T capabilities: Bit(s) Description (Table P0530) 0 attributes saved on going into power-saving mode 1 Enable/Disable Attribute Autosave subcommands are supported 2-15 reserved SeeAlso: #P0529 Format of S.M.A.R.T. attribute threshold: Offset Size Description (Table P0531) 00h BYTE attribute ID (01h-FFh) 01h BYTE attribute threshold 00h always passing 01h minimum threshold value FDh maximum threshold value FEh invalid (do not use) FFh always failing (for testing) 02h 10 BYTEs reserved (0) Note: the attribute ID and actual threshold values are vendor-specific SeeAlso: #P0528,#P0532 Format of S.M.A.R.T attribute value: Offset Size Description (Table P0532) 00h BYTE attribute ID (01h-FFh) 01h WORD status flags bit 0: pre-failure/advisory =0 value < threshold indicates usage/age exceeding design life =1 value < threshold indicates pre-failure condition bit 1: on-line data collection bits 2-5 vendor-specific bits 6-15 reserved 03h BYTE attribute value (01h-FDh) initial value prior to data collection is 64h 04h 8 BYTEs vendor-specific SeeAlso: #P0529,#P0531 (Table P0533) Values for S.M.A.R.T. off-line data collection status: 00h off-line collection never started 01h reserved 02h off-line data collection completed successfully 03h reserved 04h off-line data collection suspended by command from host 05h off-line data collection aborted by command from host 06h off-line data collection aborted due to fatal error 07h-3Fh reserved 40h-7Fh vendor-specific 80h off-line collection never started (auto-offline feature enabled) 81h reserved 82h off-line data collection completed successfully (auto-offline feature enabled) 83h reserved 84h off-line data collection suspended by command from host (auto-offline feature enabled) 85h off-line data collection aborted by command from host (auto-offline feature enabled) 86h off-line data collection aborted due to fatal error (auto-offline feature enabled) 87h-BFh reserved C0h-FFh vendor-specific SeeAlso: #P0529,#P0534 Bitfields for S.M.A.R.T. off-line data collection capabilities: Bit(s) Description (Table P0534) 0 Execute Off-Line Immediate (D4h) subcommand is implemented 1 Enable/Disable Automatic Off-Line subcommand is implemented 2 abort/resume on interrupting command =0 off-line resumes automatically after an interrupting command =1 off-line collection is aborted by an interrupting command 3-7 reserved SeeAlso: #P0527 (Table P0535) Values for Feature Code: 01h [opt] 8-bit instead of 16-bit data transfers 02h [opt] enable write cache 03h set transfer mode as specified by SectorThe smallest addressable unit of data on a disk; under MS-DOS, this is normally 512 bytes. See also Track. Count register 04h [opt] enable all automatic defect reassignment 22h [opt] Write Same, user-specified area 33h [opt] disable retries 44h specify length of ECC bytes used by Read Long and Write Long 54h [opt] set cache segments (value in SectorThe smallest addressable unit of data on a disk; under MS-DOS, this is normally 512 bytes. See also Track. Count register) 55h disable look-ahead 66h disable reverting to power-on defaults 77h [opt] disable ECC 81h [opt] 16-bit instead of 8-bit data transfers 82h [opt] disable write cache 84h [opt] disable all automatic defect reassignment 88h [opt] enable ECC 99h [opt] enable retries 9Ah [opt] set device maximum average current AAh enable look-ahead ABh [opt] set maximum prefecth (value in SectorThe smallest addressable unit of data on a disk; under MS-DOS, this is normally 512 bytes. See also Track. Count register) BBh use four bytes of ECC on Read Long and Write Long (for compat.) CCh enable reverting to power-on defaults DDh [opt] Write Same, entire disk SeeAlso: #00266