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c.
Page descriptor
The "Page descriptor" is configured from a 2-byte page header followed by a
parameter field and each parameter function attribute is classified in a unit
called a "Page." 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.
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If less than 512 bytes is specified in this field, the IDD performs
rounding processing (there is a rounding processing report), setting the
data block length at 512 bytes. If more than 528 bytes is specified,
rounding processing is performed (there is a rounding processing report),
setting the data block length at 528 bytes. If the block length is not 4-
byte boundary, rounding processing is performed to change 4-byte
boundary.
If zero is specified in this field, the value specified in bytes 12 and 13
(Data byte length/sector) of Page 3 (Format Parameter) is set. At that
time, if Page 3 is not specified at the same time, the current value in Page
3 is used.
If the value set in this field differs from the value specified in bytes 12
and 13 (Data byte length/sector) of Page 3 (Format Parameter), the data
block length in the block descriptor is set.
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), 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 of the parameter field (number of bytes)
after byte 2, excluding the page header, of the "Page descriptor" and is a
fixed value for each page code. The INIT must specify the same value as
the page length reported by the IDD 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.
4.1 Control/Sense Commands
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