Delete Partition Page 33H - Sony AIT-SDX560 Product Specifications Manual

5.25" model

Table of Contents

7. ATAPI Packet Command Specification

Bit

Byte

Reserved

(MSB)

PSUM

Partition Size Unit of Measured field defines the units in which the Partition Size value selects the partition size,

which in the case of this drive is Megabytes. Therefore, the drive returns 10b for a MODE SENSE and will only

accept this value for a MODE SELECT, otherwise a CHECK CONDITION status is returned with an ILLEGAL

REQUEST Sense Key set.

Partition units

The Partition Size Units of Measure (PSUM) field defines the units used in the partition size descriptors. A logical

unit is not required to retain the Partition Size Unit of Measure used to partition the medium. The PSUM field is

defined in the following table.

Code

00B

Bytes (unit of one)

01B

Kilobytes (10

10B

Megabytes (10

11B

Partition Size Descriptor

Partition size in megabytes, in binary notation. Bytes 8, 9: Partition Size Descriptor. For a Mode Sense Command,

the value in this field is invalid unless the Mode Sense Command follows a successful Mode Select Command.

Therefore, on power-up without a Mode Select Page 32h, the Current Page 32h Partition Size Descriptor should

be set to the default value of 00 00. There is no relation between this field and the IDP bit in the parameter block of

Mode Select Page 11h.

7.8.9.