Element Type 2: Storage (DVCID=B'1')

Table 1. Element Type 2: Storage Element Descriptor (DVCID=B'1')
Bit/byte 7 6 5 4 3 2 1 0
0–1 Element Address
2 Reserved Access Except Reserved Full
3 Reserved
6–8 Reserved
9 SValid Invert (B'0') Reserved
10–11 Source Storage Element Address
12–47 Primary Volume Tag Information
  Device ID
48 Reserved Code Set (2h)
49 Reserved Identifier Type (0h)
50 Reserved
51 Identifier Length 0h to 18h (valid identifier data)
52–75 Device Identifier
ASCII Element Information
(Always padded to 24 byte length)
Note: If the PVoltag bit is set to 0 in the CDB, the Device ID starts at byte 12.
Element Descriptor bytes 0-47 are the same as Storage Element Descriptor w/DVCID=0, as shown in Table 1. If the DVCID bit in the CDB is set to 0, the bytes 48-75 are omitted. If the DVCID bit in CDB is set to 1, bytes 48–75 are included and the following information applies:
  • Code Set: This field is set to 2h, indicating that the Identifier data contains ASCII printable characters.
  • Identifier Type: This field is set to 0h, indicating that the Identifier Type is Vendor Specific.
  • Identifier Length: This field contains the length in bytes of valid Device Identifier information. If no device identifier is available, the Identifier Length field is 0h. If the DCVID bit is set, the Identifier Length can be set between 0-24 (18h) bytes.
  • Device Identifier: The Device Identifier contains information about the element reported that can include physical location or other status. The format is ASCII. If location information is reported, it is ASCII comma separated values that represent Frame, Column, Row, and Tier (F3,C7,R34,T3). Other strings such as “Empty” or “Unknown” are reported if no cartridge is present, or if the location or status of the cartridge is unknown. The Device Identifier: field is padded with ASCII ‘space' (20h) characters to fill the complete 24 bytes. If the DVCID bit is set and the Identifier Length is 0, this field still contains 24 bytes.