Seagate STT8000A Manual download pdf (Page 55)

ATAPI Interface Chapter 5

STT8000A Product Manual Page 47

Mode Select command

Bit

Byte

76543210

0 Operation code (15h)

1 Reserved 1 (PF) Reserved

2 Reserved

3 (MSB) Parameter List Length

4 (LSB)

5 Reserved

The Mode Select command provides a means to change device parameters. The

PF (Page Format) bit is 1, since the Mode Pages are in SCSI-2 format. The only

changeable parameters are Speed Selection (in the Mode Parameter Header), and

certain fields in Mode Page 2Bh (MFM mode). The Parameter List Length field

specifies the length in bytes of the Mode Select parameter list that are transferred to

the device as data. A Parameter List Length of zero indicates that no data is

transferred.

Mode Sense should be issued prior to Mode Select to determine the supported

pages, page lengths, and other parameters.

The device terminates the Mode Select command with a Check Condition status,

sets the Sense Key to Illegal Request, and sets the Additional Sense Code to

Invalid Field in Parameter List for the following conditions:

• If an attempt is made to change an unchangeable value in the Mode Select

header, block descriptor, or any page.

• If an attempt is made to send a page with a length not equal to the parameter

length reported for that page by the Mode Sense command.

• If an attempt is made to send a value for a parameter that is outside the range

supported by the device.

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Seagate STT8000A Manual Page 55