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C141-E124-01EN 4 - 19
4.1.4 Drive parameter (page code = 4)
The page descriptor format of this MODE SELECT parameter is shown in Figure 4.4.
Bit
Byte
76543210
0 00000100
1 X‘16’, X‘12’ or X‘0A’ (Page Length)
2-4 Cylinder Count
Default X‘00xxxx’
Variable X‘000000’
5 Number of Heads
Default X‘00xx’
Variable X‘0000’
6-8 "Write Precompensation" Starting Cylinder
Default X‘000000’
Variable X’000000’
9-11 "Reduced Write Current" Starting Cylinder
Default X‘000000’
Variable X‘000000’
12-13 Drive Step Rate
Default X‘0000’
Variable X‘0000’
14-16 Landing Zone Cylinder
Default X‘000000’
Variable X‘000000’
17 000000 RPL
Default00000000
Variable00000000
18 Rotational Synchronization Offset
Default X‘00’
Variable X‘00’
19 X‘00’ (Reserved)
20-21 Rotational Speed
Default X’2729’ or X’3A98’
Variable X‘0000’
22-23 X‘0000’ (Reserved)
Figure 4.4 MODE SELECT parameters: drive parameters
Note:
When transfer of this page is requested by the MODE SENSE or MODE SENSE
EXTENDED command, the IDD reports X '16' as the page length. However, in the MODE
SELECT and MODE SELECT EXTENDED commands, if either X '16,' X '12' or X '0A' is
specified, it is treated as if the IDD has specified the correct page length. The X '12' and X
'0A' page lengths have been included in consideration of compatibility with previous models,
but it is recommended that the INIT use the X '16' page length to support expanded
specifications in the future.
(See the
"Note")
(10,025 rpm or
15,000 rpm)