Reference Guide

Chapter 4 SCSI Commands
Use of DLTSage WORM Tapes
DLT-S4 Interface Reference Guide 346
If the initial criteria are met the following operations are done:
The cartridge is formatted;
The DLTSage WORM indicator is written in three places;
• An End Of Data (EOD) marker is placed at the Beginning of Tape
(BOT); and
• The DLTSage WORM tag is created and written to the MAM data.
Once the initialization process successfully completes, the DLTtape S4
cartridge is ready to be used in WORM mode.
Use of DLTSage WORM Tapes 1
After a DLTSage WORM tape has been created, it may be used to record
write once datasets. When writing a new dataset, it must be appended to
the End of Data position on the tape. Attempts to write while the tape is at
a position other than EOD will be rejected and no data will be accepted
from the host. The EOD mark will be written at the end of each new
dataset. EOD will be written after all remaining user data is flushed to the
tape and any type of position command or read command is given to the
drive (e.g.
REWIND). EOD will be written to tape if a WRITE FILEMARK 0
command is received by the drive. EOD will also be written if the Write
Delay Time parameter of the
MODE SELECT/SENSE Device Configuration
Page is reached (no further data was received from the host).
A DLTSage WORM tape may be read as often as the user requires.
DLTSage WORM Details 1 The following sections contain specific methods to:
• Determining if the SDLT drive is DLTSage WORM capable;
• Determining if the currently loaded cartridge is a DLTSage WORM
tape;
• Converting an SDLT data cartridge into a DLTSage WORM cartridge;
• Reading the DLTSage WORM signature;
• Understanding unique sense data reported while using DLTSage
WORM cartridges,