Worm (Write Once, Read Many) Cartridge; Ultrium Data Cartridge On The Left; Worm - IBM L5X Installation And User Manual

If the switch is in the locked position,
the tape. If the switch is in the unlocked position (black void), data can be written
to the tape.
If you must manually set the write-protect switch, slide it left or right to the
desired position.

WORM (Write Once, Read Many) cartridge

Certain records-retention and data-security applications require a Write Once, Read
Many (WORM) method for storing data on tape. The LTO Ultrium generation 3, 4
and 5 drives enable WORM support when a WORM tape cartridge is loaded into
the drive.
Because standard read/write media are incompatible with the WORM feature, a
specially formatted WORM tape cartridge (see Figure 10) is required. Each WORM
cartridge has a unique, worldwide cartridge identifier (WWCID), which is
comprised of the unique CM chip serial number and the unique tape media serial
number.
Figure 10. Ultrium data cartridge on the left; WORM cartridge on the right
Type of cartridge
Ultrium 5 WORM Burgundy and silvery
Ultrium 4 WORM Green and silvery gray 800 GB (1,600 GB at 2:1
Ultrium 3 WORM Slate blue and silvery
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The first set of tracks, which is 16 for Ultrium 5, 4 and 3 cartridges, is written from near the beginning of the tape
to near the end of the tape. The head then repositions to the next set of tracks for the return pass. This process
continues until all tracks are written and the cartridge is full, or until all of your data is written.
Data security on WORM media
Certain built-in security measures help make sure that the data written on a
WORM cartridge does not become compromised, for example:
v The format of a WORM cartridge is unlike that of standard read/write media.
v When the drive senses a WORM cartridge, the firmware prohibits the changing
Case color Native data capacity
1,500 GB (3,000 GB at 2:1
gray compression)
compression)
400 GB (800 GB at 2:1
gray compression)
This unique format prevents a drive that lacks WORM-capable firmware from
writing on a WORM cartridge.
of user data already written on the tape. The firmware keeps track of the last
appendable point on the tape.
(solid red), data cannot be written to
Recording format
Reads and writes data on 1,280 tracks,
16 tracks at a time
Reads and writes data on 896 tracks, 16
tracks at a time
Reads and writes data on 704 tracks, 16
tracks at a time
Chapter 4. Using Ultrium media
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