Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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1 0 Report default value. The drive returns the default values for the page code specified. The parameters not supported
by the drive are set to zero.
1 1 Report saved value. The drive returns the saved value for the page code specified.
Saved values are one of the following:
- the values saved as a result of MODE SELECT command
- identical to the default values
- zero when the parameters are not supported
The Page Length byte value of each page returned by the drive indicates up to which fields are supported on that
page.
Page Code: This field specifies which page or pages to return. Page code usage is defined in the figure below.
Table 141:Page Code Usage
If a Page Code of 3Fh is used, MODE SENSE returns the pages in ascending order with one exception. Page 0 is always
returned last in response to a MODE SENSE command.
If an unsupported page is selected, the command is terminated with a CHECKT CONDITION status and available sense of
ILLEGAL REQUEST/INVALID FIELD IN CDB.
Subpage Code: This field specifies the subpage to return, and may be set to a specific page, or to FFh for all supported sub-
pages.
19.10.1 Mode Parameter List
The mode parameter list contains a header followed by zero or more block descriptors followed by zero or more variable
length pages.

19.10.1.1 Header

The 6-byte command descriptor block header is defined below.
Table 142:Mode parameter header (6)
The 10-byte CDB header is defined below.
Page Code Description
00h - 1Ch
3Fh
Return specific page, if supported.
Return all supported pages.
Byte Bit
76543210
0 Mode Data Length
1Medium Type = 0
2 WP=0 Reserved=0 DPOFUA
=1 Reserved = 0
3 Block Descriptor Length (= 0 or 8)