Verify 13H - Sony DDS-4 Product Description Manual

6. COMMAND SPECIFICATION

6. 26 VERIFY 13h

Bit 7
Byte
0
1
2 (MSB)
3
4
5 Unused (00b)
VERIFY verifies one or more blocks beginning with the next block on the tape. The verification is a media verification
only. No data is transferred between the Host and the drive.
Fixed:
This bit specifies both the meaning of the Verification Length field and whether fixed-length or variable-length
blocks are to be verified.
If the Fixed bit is set to zero, Variable Block mode is requested. A single block is verified with the Verification
Length specifying the maximum number of bytes that are to be verified.
If the Fixed bit is set to one, the Verification Length specifies the number of blocks to be verified by the drive. This
is valid only if the logical unit is currently operating in Fixed Block mode, in other words, when it has been in-
structed to use fixed-length blocks with MODE SELECT. The current block length is the block length defined in
the MODE SELECT command. If the Fixed bit is set and the drive is in Variable Block mode, the VERIFY is
rejected with a CHECK CONDITION status and an ILLEGAL REQUEST sense key set. The VERIFY is also
rejected if the drive is in Fixed Block mode and the Fixed bit is not set with a CHECK CONDITION status and an
ILLEGAL REQUEST sense key set.
BytCmp:
This function is not supported. If this bit is set, the command is rejected with a CHECK CONDITION status with
the ILLEGAL REQUEST sense key set.
Immed:
This function is not supported. If this bit is set, the command is rejected with a CHECK CONDITION status with
the ILLEGAL REQUEST sense key set.
VERIFY terminates when the Verification Length has been satisfied, when a Filemark, a Save-Set Mark (if the drive has
been configured to report Setmarks), EOD or the physical EOM is encountered. The status and sense data for each of
these conditions are handled in the same manner as in READ. Upon completion of VERIFY, the logical position is
located after the last block from which data was verified or after the Filemark, or Setmark, if one is encountered. When
the Verification Length is zero, no data is verified and the current logical position is not be changed.
If the actual block length is different from the Verification Length, a CHECK CONDITION status is returned. Within
the Sense data, the Incorrect Length Indicator (ILI) bit and Valid bit will be set to one, the Sense Key field is set to NO
SENSE and the Information Bytes are set to the difference (residue) between the requested Verification length and the
actual block length, or in Blocked Mode, the difference (residue) between the requested number of blocks and the actual
number of blocks verified.
6 - 96 SONY SDT-10000/SDT-11000 DDS Tape Drive
6 5
Logical Unit Number
4 3
Operation Code (13h)
Reserved Immed (0) BytCmp (0)
Verification Length
Reserved
VERIFY
2 1 0
Fixed
(LSB)