Seagate ST3660A Product Manual - Page 31

Identify Drive command EC

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Medalist XE Family Product Manual, Rev. B 23 3.3.1 Identify Drive command (ECH) The Identify Drive command transfers information about the drive to the host after power up. The data is organized as a single 512-byte block of data. The block's contents are shown in the table below. All reserved bits or words must be set to zero. Parameters listed with an "x" are drive-specific or vary with the state of the drive. The sector buffer parameters for ST3295A and ST3660A drives are listed in the table below. For a complete description of the Identify Drive command, see the Seagate ATA Interface Reference Manual, publication number 36111-xxx. Word 0 11 2 3 4 5 6 7-9 continued Description Value Configuration information Bit 10: 1 = disc transfer greater than 10 Mbits/sec Bit 6: 1 = fixed drive Bit 4: 1 = head switch time > 15 µsec Bit 3: 1 = not MFM encoded Bit 1: 1 = hard-sectored disc 045AH Number of fixed cylinders (default logical emulation) ST3295A: 2F9H ST3660A: 421H ATA reserved 0000H Number of heads (default) ST3295A: EH ST3660A: 10H Number of unformatted bytes 8D90H per track Number of unformatted bytes 0248H per sector Number of sectors per track ST3295A: 32H (default logical emulation) ST3660A: 3FH ATA reserved (vendorunique) 0000H 1. The ST3660A default cylinder count is 1,057. Some DOS and BIOS combinations do not support more than 1,024 cylinders. You can format the drive using 1,024 cylinders, which limits the accessible capacity to 528 Mbytes, or use one of the solutions listed on page 2 to access the drive's full capacity.

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3.3.1
Identify Drive command (EC
H
)
The Identify Drive command transfers information about the drive to the
host after power up. The data is organized as a single 512-byte block of
data. The block’s contents are shown in the table below. All reserved bits
or words must be set to zero. Parameters listed with an “x” are drive-spe-
cific or vary with the state of the drive.
The sector buffer parameters for ST3295A and ST3660A drives are listed
in the table below. For a complete description of the Identify Drive
command, see the
Seagate ATA Interface Reference Manual
, publication
number 36111-
xxx
.
Word
Description
Value
0
Configuration information
Bit 10: 1 = disc transfer
greater than 10 Mbits/sec
Bit 6: 1 = fixed drive
Bit 4: 1 = head switch time
> 15
μ
sec
Bit 3: 1 = not MFM encoded
Bit 1: 1 = hard-sectored disc
045A
H
1
1
Number of fixed cylinders
(default logical emulation)
ST3295A:
2F9
H
ST3660A:
421
H
2
ATA reserved
0000
H
3
Number of heads (default)
ST3295A:
E
H
ST3660A:
10
H
4
Number of unformatted bytes
per track
8D90
H
5
Number of unformatted bytes
per sector
0248
H
6
Number of sectors per track
(default logical emulation)
ST3295A:
32
H
ST3660A:
3F
H
7–9
ATA reserved (vendor-
unique)
0000
H
continued
1. The ST3660A default cylinder count is 1,057. Some DOS and BIOS
combinations do not support more than 1,024 cylinders. You can
format the drive using 1,024 cylinders, which limits the accessible
capacity to 528 Mbytes, or use one of the solutions listed on page 2 to
access the drive’s full capacity.
Medalist XE Family Product Manual, Rev. B
23