Datasheet
Table 2. Identify Drive Information
Word Data Description
0 848Ah General configuration bit-significant information:
bit Data Description
15 1 Non-rotating disk drive
14 0 Format speed tolerance gap not required
13 0 Track offset option not available
12 0 Data strobe offset option not available
11 0 Rotational speed tolerance is < 0.5%
10 1 Disk transfer rate > 10Mbs
9 0 10 Mbs <= Disk transfer rate > 5Mbs
8 0 Disk transfer rate !<= 5Mbs
7 1 Removable cartridge drive
6 0 Not a fixed drive
5 0 Spindle motor control option not implemented
4 0
Head switch time !> 15µsec
3 1 Not MFM encoded
2 0 Not soft sectored
1 1 Hard sectored
0 0 reserved
1 Note 1 Number of Cylinders
2 0000h reserved
3 0008h Number of Heads
4 4000h Number of unformatted bytes per track
5 0200h Number of unformatted bytes per sector
6 0020h Number of sectors per track
7-9 0000h 0000h 0000h vendor unique
10-19 2020h ...2020h 20 ASCII char serial number. Words 10-19 are filled with 20 ASCII ‘space’ chars, 20h
20 0003h Buffer type: Dual ported, multi-sector, w/read cache
21 0002h Bufer size, in 512 byte increments
22 0004h ECC length
23-26 ‘00001.02’ Firmware revision, 8 ASCII chars
27-46 ‘ ðððð ’ Model number, 40 ASCII chars. Note: ‘ð ’ denotes the ASCII ‘space’ character, 20h
ð ð’
‘ððð ð’
47 0001h Maximum Block Count=1 for Read/write Multiple commands
48 0000h Cannot perform doubleword I/O
49 0200h Capabilities: LBA supported, DMA not supported
50 0000h reserved
51 0200h PIO timing mode 2,
52 0000h DMA transfer not supported
53 0001h Words 54 - 58 are valid
54 Note 1 Number of Current Cylinders
55 Note 1 Number of Current Heads
56 Note 1 Number of Current Sectors Per Track
57 Note 1 LSW of the Current Capacity in Sectors
58 0000h MSW of the Current Capacity in Sectors
59 0001h Current Setting for Block Count=1 for R/W Multiple commands
60 Note 1 LSW of the total number of user addressable LBA’s
61 0000h MSW of the total number of user addressable LBA’s
62 0000h DMA transfer not supported
63 0000h DMA transfer not supported
64-127 2020h ... reserved. Words 64 through 255 are filled with the ASCII ‘space’ character, 20h
128-159 ... 2020h ... vendor unique
160-255 ... 2020h reserved
Note 1: These values are dependent upon the total capacity of the specific card.