Table of Contents
Advertisement
14. Appendix F
14.1.3. User Volume Note & User Partition Note
The drive interface supports host application access to the following data structures: the User Volume Note (UVN)
representing user supplied information related to the contents of the cassette; and the User Partition Note (UPN)
representing user supplied information related to each partition. These structures are contained within the MIC User
Data Area and their contents are application dependent. Applications are not required to maintain this data.
UVN is created by Log Select Page 3Eh Parameter Code 0001h. UPN is created by Log Select Page 3Eh Parameter
Code 0002h + Partition Number. Once UVN and UPN are created they cannot be discarded except through Mode
Select Page 11h that reformats the cassette. Each UVN and UPN may be overwritten with new data of exactly the
same data length. The exception to this rule is the last data structure within the MIC User Data Area: it can be
expanded or shrunk. The maximum size of a data structure is limited by the current MIC free byte count, while the
minimum size is ONE byte (Log Sense Page 3Dh Parameter Code 0003h). The internal format of the data is
application dependent.
The MIC User Data Area may contain the following combinations of user defined UVN and UPN structures, where
"data X" represents data structures that can be resized and "data A" represents data structures of fixed size:
UVN
0
no data
1
data X
2
no data
3
data A
4
no data
5
data A
6
no data
7
data A
14.1.4. Super High Speed Search Map
When writing a tape, the drive stores physical positioning information in MIC. This information makes subsequent
fast search operations possible.
14.1.5. Example of Usage
The information is organized within MIC using fixed size fields for system information and variable size fields for the
user-defined and user-maintained User Data Area. The Sony SDX-460V provides the SCSI Log Sense and Log
Select Vendor Unique Page to access this information. The page 3Dh is used to access the fixed length fields, while
the page 3Eh is used to access the variable length information in MIC.
The following example shows a two partition case, in which the host application can make use of up to 6,560 bytes of
space reserved for User Data Area. In case of a 64 kbit version of MIC, the MIC header consumes 1,024 bytes,
system logs for partitions 0 and 1 utilize 128 bytes, and the Super High Speed Search Map portion consumes 480
bytes. In this example, the application uses the entire User Data Area for UVN:
14-2
UPN for partition 0
no data
no data
data X
data X
no data
no data
data A
data A
SONY AIT-1Turbo drive SDX-460V series Ver.1.0
UPN for partition 1
no data
no data
no data
no data
data X
data X
data X
data X
Hide quick links:
Advertisement
Table of Contents
