/DENSITY=density-value
Allows you to specify the format density value for certain tapes
and disks.
For magnetic tape volumes, specifies the density in bits per inch
(bpi) at which the magnetic tape is to be written. The density
value specified can be 800 bpi, 1600 bpi, or 6250 bpi, as long as
the density is supported by the magnetic tape drive.
If you do not specify a density value for a blank magnetic tape,
the system uses a default density of the highest value allowed
by the tape drive. If the drive allows 6250-, 1600-, and 800-bpi
operation, the default density is 6250 bpi.
If you do not specify a density value for a magnetic tape that
has been previously written, the system uses the density of the
first record on the volume. If the record is unusually short, the
density value will not default.
The /DENSITY qualifier does not apply to any TF tape device.
Valid tape density values are:
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 keywords above are understood by TMSCP/TUDRIVER
code prior to OpenVMS Version 7.2. The remaining keywords in this
table are supported only on Alpha 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
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.
To format a diskette on RXnn diskette drives, use the
INITIALIZE/DENSITY command. Specify the density at which the
diskette is to be formatted as follows:
Keyword Meaning
single RX01 - 8 inch
double RX02 - 8 inch
dd double density: 720K - 3 1/2 inch
hd high density: 1.44MB - 3 1/2 inch
ed extended density: 2.88MB - 3 1/2 inch
If you do not specify a density value for a diskette being
initialized on a drive, the system leaves the volume at the
density to which the volume was last formatted.
NOTE
RX33 diskettes cannot be read from or written to by RX50
disk drives. RX50 diskettes can be read from and written to
by RX33 disk drives; they cannot be formatted by RX33 disk
drives.