Sony DDS-4 Product Description Manual page 148

6. COMMAND SPECIFICATION
VERIFY
If the drive encounters a Filemark, the drive will return a CHECK CONDITION status. Within the Sense data, the
Filemark and Valid bits are set and the Sense Key field is set to NO SENSE. The Information fields contain the residue
count. The Additional Sense Code and Additional Sense Code Qualifier fields are set to Filemark Detected. Upon
termination, the media will be logically positioned after the Filemark (EOM side).
If, however, the drive encounters a Setmark during VERIFY, nothing is reported unless the drive has been configured
through MODE SELECT to Report Setmarks. The drive will space over the Setmark and continue the VERIFY. If the
Report Setmarks configuration is enabled then the Filemark and Valid bits are set and the Sense Key field is set to NO
SENSE. The Information fields contain the residue count and the Additional Sense Code and Additional Sense Code
Qualifier fields are set to Setmark Detected. The tape is logically positioned after the Setmark (EOM side).
If the drive detects EOD during VERIFY, the drive will return a CHECK CONDITION status. Within the Sense data,
the Filemark and Valid bits are set and the Sense Key field is set to BLANK CHECK. The Information fields contain the
residue count. The Additional Sense Code and Additional Sense Code Qualifier fields are not set. Upon termination,
the media will be physically positioned before EOD and after the last block on tape.
The meaning of EOM is different for VERIFY than for a WRITE type of command. EOM is only reported when the
physical EOM/P is encountered. The drive returns a CHECK CONDITION status. The EOM and Valid bits are set and
the Sense Key is set to MEDIUM ERROR. The Information fields contain the residue count and the Additional Sense
Code and Additional Sense Code Qualifier fields are set to EOM/P Detected. The tape is physically positioned at EOM/
P.
For a Filemark, a (reported) Setmark, EOD or EOM detected, if the Fixed bit is set, the Information field in the Request
Sense Data will be set to the difference (residue) between the requested Verification Length and the actual number of
blocks verified (not including the Filemark or Setmark). If the fixed bit is set to zero, the information bytes will be set
to the difference (residue) between the requested Verification Length and the actual number of bytes verified. Filemarks
and Setmarks are considered to have a byte count of zero, though this does not cause the ILI bit to be set.
VERIFY may return the following sense keys on a CHECK CONDITION:
NO SENSE: If the actual block length is different from the specified Verification Length, in Variable Block mode, the
Incorrect Length Indicator (ILI) bit and Valid bit are set to one. The Information bytes in extended sense are set to the
difference (residue) between the requested length and the actual block length. In blocked mode, they are set to the
difference (residue) between the requested number of blocks and the actual number of blocks verified.
If the drive reads a Filemark during this command, it will set the Filemark bit in the Request Sense data. Upon termina-
tion, the tape will be logically positioned after the Filemark (EOM side). If, however, the drive encounters a Setmark
during this command, nothing will be reported unless the SDT-10000/SDT-11000 has been configured through MODE
SELECT to Report Setmarks.
If the Report Setmarks configuration is enabled, then the Valid bit and the Additional Sense Key flags will be set in the
Request Sense data to indicate that a Setmark has been encountered. The tape will also be logically positioned after the
Save-Set Mark (EOM side). For both a Filemark and a (reported) Setmark, if the Fixed bit is one, the Information bytes
in the Request Sense data are set to the difference (residue) between the requested Verification Length and the actual
number of blocks verified (not including the Filemark or Setmark). If the Fixed bit is set to zero, the Information blocks
will be set to the difference (residue) between the requested Verification Length and the actual number of bytes verified.
Filemarks and Save-Set Marks are considered to have a byte count of zero, though this will not cause the ILI bit to be set.
SONY SDT-10000/SDT-11000 DDS Tape Drive 6 - 97