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The following is the data structure for the User Volume Note:
Header Information
User Data
For example, SDX-550V will allocate (8+1+7) bytes for the creation of ONE byte of UVN. The 7 bytes is
the dummy data for padding that is added by the drive automatically in its memory management.
SDX-550V will reports that the UVN size is ONE byte, and the UVN must update with new data of the
same size (1 byte).
For example, SDX-550V will allocate (8+8+0) bytes for the creation of 8 bytes of UVN. The 0 bytes is the
dummy data for padding that is added by the drive automatically in its memory management. SDX-550V
will reports that the UVN size is 8 bytes, and the UVN must update with new data of the same size
(8bytes).
For example, SDX-550V will allocate (8+9+14) bytes for the creation of 9 byte of UVN. The 14 bytes is
the dummy data for padding that is added by the drive automatically in its memory management.
SDX-550V will reports that the UVN size is 9 byte, and the UVN must update with new data of the same
size (9 bytes).
This is the data structure for User Partition Note:
Header Information
User Data
The drive manages the User Volume Note Header and User Partition Note Headers. These operations are
transparent to the user. When the drive reports the MIC free memory capacity (MIC free byte count) through Log
Sense Page 3Dh Parameter Code 0003h, it includes the Header count. The user may use this information to write
the entire MIC. For example, if MIC free byte count is 100, the user, on the next Log Select command, may write the
entire MIC with this value to either the MIC User Volume Note or MIC User Partition Note area. The free byte count
following this command will be ZERO. The user cannot write another Note area, or to rewrite the same Note area
with a larger data length. However, the user is allowed to rewrite to this same Note area with the same amount of
data; if the Note area is the last one within the User Note Area, it can be rewritten with a smaller amount of data as
well.
The example of writing MIC follows. The free byte count is read with the Log Sense Page 3Dh Parameter Code
0003h.
SONY AIT-2 Turbo drive SDX-550V series Ver.1.0
8 bytes of memory management information
10 bytes of memory management information
13.Appendix F
13-3
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