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Command Specifications
c. Page descriptor
The "Page Descriptor" consists of a two-byte page header (or four-byte page
header when using subpage format) followed by a parameter field. It is
classified based on the parameter function attribute into units called "Pages."
The individual "Page descriptors" in the MODE SELECT and MODE
SELECT EXTENDED commands may be specified independently by the
INIT and multiple "Page descriptors" may be specified continuously in the
desired sequence.
− Page code
This field specifies a code (Page No.) that indicates the type of "Page
descriptor."
− SPF (Sub Page Format)
When this bit is set to "0," this indicates that the Page_0 Format (Short
Page Format) is being used, and when this bit is set to "1," this indicates
that the Sub_Page Format (Long Page Format) is being used.
If "1" is specified for a page that does not support the Sub_Page Format
(pages other than Page 19 and Page 1C), the MODE SELECT command
is terminated with the CHECK CONDITION status (ILLEGAL
REQUEST [= 5]/Invalid Field in Parameter List [= 26/00]) and all the
parameters specified with the command are invalidated.
− Page length
This field indicates the length (in bytes) of the parameter field subsequent
to byte 2 (or byte 4 when using subpage format), excluding the page
header of the Page Descriptor." This length is specific to each page code.
The INIT must specify the same value as the page length reported by the
HDD in the MODE SENSE or MODE SENSE EXTENDED command,
except in cases it is described in each of the page descriptor descriptions
in this item.
d. MODE SELECT parameters of the HDD
The parameter list configuration and its length that can be transferred to the
HDD by the INIT in the MODE SENSE or MODE SENSE EXTENDED
command are as shown in Table 4.13. If a "Page descriptor" that is not
supported by the HDD is specified, the command is terminated with a
CHECK CONDITION status (ILLEGAL REQUEST [=5] / Invalid field in
parameter list [=26-00]), and all the MODE SELECT parameters transferred
in the command are disabled.
160 C141-C013