Verify (Not For Slr7 And Slr140); Command Description - Tandberg Data SLR7-140 PROGRAMMER Manual

29.
Verify
(not for SLR7 and SLR140)

29.1. Command Description

The VERIFY command
beginning with the next block on the tape.
The VERIFY command can operate in two different modes
indicated by the Byte Compare (CMP) bit.
bit is set to zero, the verification is simply a medium
verification (CRC/ECC check) and no data is transferred
from the Initiator to the Drive. When the CMP bit is set
to one, the Drive will perform a byte-by-byte compare of
the data read from the tape and the data transferred
from the Initiator.
Initiator to the Drive as in a WRITE command.
The Fixed (FIX) bit specifies both the meaning of the
Verification Length field and whether fixed-length or
variable length block(s) are to be verified.
When the FIX bit is set to zero, the Drive is requested
to verify a single
Verification Length specifies the block length in number
of bytes. The actual block length is expected to be
equal to the specified block length.
When the FIX bit is set to one, the Drive is requested
to verify the requested number of fixed length blocks.
All the blocks are expected to be of the same length.
The length expected is the length reported by the MODE
SENSE command (the
Descriptor List). Note that a FIX bit of one is not
legal when the Drive has been set into Variable Block
mode. Variable Block mode is in effect when the Block
Size field in the Block Descriptor List of the MODE
SELECT command is set to zero (000000h). See the MODE
SELECT command for further details.
If the requested Verification Length is zero, the Drive
will verify no data and the logical tape position will
not be changed. This will not be considered as an error.
If the VERIFY command is the first media access command
executed on a
operation will start from BOP. If the VERIFY command
follows an ERASE, LOAD/UNLOAD (with Load bit set to one)
or REWIND command, the verify operation will also start
from BOP. If the VERIFY command follows a READ, LOCATE,
SPACE or another VERIFY command, the verify operation
will start with the next block on the tape.
Upon termination of a successful VERIFY command, the
logical tape position
(fixed or variable) verified (end-of-partition side).
In the Drive the actual data compare will be done on the
SCSI-bus side of the data buffer. This means that when a
VERIFY command
already been verified.
deferred errors occur due to a miscompare.
If disconnection is allowed, the Drive will disconnect
when executing this command.
29-1 Tandberg SLR Product Line SCSI Functional Specifications
verifies one
Data is
variable length
Block Size
newly inserted
will be
terminates, all
This will
or more block(s)
When the CMP
transferred from
data block.
field of the
cartridge, the
after the last
data transferred
guarantee that
the
The
Block
verify
block
have
no