Maxtor 10K V - Manual (Page 96)

5-38 Maxtor Atlas 10K V
Table 5-56
Mode Parameter Block Descriptor-Field Descriptions
5.12.4 Categories of Changeable Pages
The drive’s changeable pages are described on the following pages. The data fields for
each of these pages fall into one of the categories described in Table 5-57.
Table 5-57
Categories of Changeable Pages
5.12.5 Unit Attention Condition Page (00h)
The Unit Attention Page is used to enable or disable the generation of Unit Attention
Conditions. The Unit Attention Condition Page format and field descriptions are
described in Table 5-58 and Table 5-59 respectively.
Table 5-58
Unit Attention Condition Page (Page 0)
Field Description
Number of Blocks
If the number of blocks is set to zero, the device shall retain its current capacity if the
block size has not changed. If the number of blocks is set to zero and the block size has
changed, the device shall be set to its maximum capacity when the new block size takes
effect.
If the number of blocks is greater than zero and less than or equal to its maximum ca-
pacity, the device shall be set to that number of blocks. If the block size has not changed,
the device shall not become format corrupted. This capacity setting shall be retained
through power cycles, hard resets, logical unit resets and I_T nexus losses:
If the number of blocks field is set to a value greater than the maximum capacity of the
device and less than FFFF FFFFh, then the command is terminated with a CHECK
CONDITION status. The sense key is set to ILLEGAL REQUEST. The device shall re-
tain its previous block descriptor settings; or
If the number of blocks is set to FFFF FFFFh, the device shall be set to its maximum
capacity. If the block size has not changed, the device shall not become format corrupt-
ed. This capacity setting shall be retained through power cycles, hard resets, logical unit
resets, and I_T nexus losses.
Block Length This field specifies the length, in bytes, of each logical sector.
Category Description
Fully Supported
A field in this category can be modified by the MODE SELECT command, can be saved and can
affect the drives processing. The drive uses the value in the field and, if the SP bit is set, preserves
the new value of the field in non-volatile memory on the drive. (The PS bit must have been set
when the mode page was returned with a MODE SENSE command.)
Ignored
A value in this field is never used or validated; it is never looked at by the drive. Ignored fields are
not underlined in the Mode Parameter Pages’ figures or tables and are not described in the Field
Description tables.
Bit
Byte
7 6 5 4 3 2 1 0
0 PS Rsvd Page Code (00h)
1 Page Length (02h)
2 Reserved DUA Reserved
3 Reserved (00h)