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Mode select (6) command (15h) (continued) – Quantum 10K II User Manual

Page 142

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SCSI Description

Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives

5–75

MODE SELECT (6) Command (15h) (continued)

Table 5–36 Caching Page — Field Descriptions (continued)

Default

Field

Value

Description

Minimum Pre-fetch

0

This field indicates the number of sectors that are to be pre-fetched.
See also MF.

Maximum Pre-fetch 0421h

This field indicates the maximum amount of data to pre-fetch into
the cache as a result of one READ command. Not supported by
the drive.

Maximum Pre-fetch 0421h

Specifies an upper limit on the number of logical blocks

Ceiling

computed as the maximum pre-fetch. If this number of sectors is
greater than the maximum pre-fetch, then the number of logical
blocks to pre-fetch is reduced to the value stored in the maximum
pre-fetch ceiling field. Not supported by the drive.

FSW

0

The Force Sequential Write bit. Not supported by the drive.

LBCSS

0

The Logical Block Cache Segment Size bit. Not supported by the
drive.

DRA

0

The Disable Read-Ahead bit. Not supported by the drive.

VS

The Vendor-Specific bits. Not supported by the drive.

Number of Cache

27

Ignored by the drive.

Segments
Cache Segment Size

0

Not supported by the drive.

Non-Cache Segment

0

Not supported by the drive.

Size
NOTE:

Fully supported fields are underlined. Unsupported and ignored fields are not underlined.
The PS bit is underlined, meaning it will be set on a MODE SENSE command, since the
page is savable.