/DENSITY=keyword
Specifies the density at which a magnetic tape is to be written.
This qualifier is valid only if you mount a tape specifying the
/FOREIGN qualifier. If you change the density on a tape, the
first operation on the tape must be a write operation.
The densities supported for tapes are shown in the following
table:
Table 1 Keywords for Tapes
Keyword Meaning
DEFAULT Default density
800 NRZI 800 bits per inch (BPI)
1600 PE 1600 BPI
6250 GRC 6250 BPI
3480 IBM 3480 HPC 39872 BPI
3490E IBM 3480 compressed
833 DLT TK50: 833 BPI
TK50 DLT TK50: 833 BPI
TK70 DLT TK70: 1250 BPI
6250 RV80 6250 BPI EQUIVALENT
NOTE: Only the symbols listed above are understood
by TMSCP/TUDRIVER code prior to OpenVMS Version 7.2.
The remaining symbols in this table are supported
only on OpenVMS Alpha and Integrity server systems.
TK85 DLT Tx85: 10625 BPI-Cmpt III - Alpha/Integrity
servers only
TK86 DLT Tx86: 10626 BPI-Cmpt III - Alpha/Integrity
servers only
TK87 DLT Tx87: 62500 BPI-Cmpt III - Alpha/Integrity
servers only
TK88 DLT Tx88: (Quantum 4000)-Cmpt IV - Alpha/Integrity
servers only
TK89 DLT Tx89: (Quantum 7000)-Cmpt IV - Alpha/Integrity
servers only
QIC All QIC drives are drive-settable only -
Alpha/Integrity servers only
TK85 DLT Tx85: 10625 BPI-Cmpt III - Alpha/Integrity
servers only
TK86 DLT Tx86: 10626 BPI-Cmpt III - Alpha/Integrity
servers only
TK87 DLT Tx87: 62500 BPI-Cmpt III - Alpha/Integrity
servers only
TK88 DLT Tx88: (Quantum 4000)-Cmpt IV - Alpha/Integrity
servers only
TK89 DLT Tx89: (Quantum 7000)-Cmpt IV - Alpha/Integrity
servers only
QIC All QIC drives are drive-settable only -
Alpha/Integrity servers only
8200 Exa-Byte 8200 - Alpha/Integrity servers only
8500 Exa-Byte 8500 - Alpha/Integrity servers only
DDS1 Digital Data Storage 1-2G - Alpha/Integrity
servers only
DDS2 Digital Data Storage 2-4G - Alpha/Integrity
servers only
DDS3 Digital Data Storage 3-8-10G - Alpha/Integrity
servers only
DDS4 Digital Data Storage 4 - Alpha/Integrity servers
only
AIT1 Sony Advanced Intelligent Tape 1 - Alpha/Integrity
servers only
AIT2 Sony Advanced Intelligent Tape 2 - Alpha/Integrity
servers only
AIT3 Sony Advanced Intelligent Tape 3 - Alpha/Integrity
servers only
AIT4 Sony Advanced Intelligent Tape 4 - Alpha/Integrity
servers only
DLT8000 DLT 8000 - Alpha/Integrity servers only
8900 Exabyte 8900 - Alpha/Integrity servers only
SDLT SuperDLT1 - Alpha/Integrity servers only
SDLT320 SuperDLT320 - Alpha/Integrity servers only
Note that tape density keywords cannot be abbreviated.
When you initialize a tape with the INITIALIZE command and do
not specify a density, the tape is initialized at the default
density for the media and drive you are using (usually the
highest density available).
The density of a tape can only be changed if the tape is at
beginning-of-tape (BOT). To change the density of a tape that
has previously been recorded, the first operation must be a
write operation. If the first operation on the tape is a read
operation, the magnetic tape is set to the density at which the
first record on the tape was recorded, no matter what density is
specified with the /DENSITY qualifier.
Example
The following command mounts a tape on the MFA0: drive /FOREIGN
and assigns it the logical name TAPE. The /DENSITY qualifier
specifies that the tape is to be written at TK87.
$ MOUNT/FOREIGN/DENSITY=TK87 MFA0: TAPE