IBM Ultrium Gen 6, Installation And User Manual

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Type of cartridge Case color Native data capacity Recording format
1
Ultrium 6 WORM Black and silvery gray 2500 GB (6250 GB at 2.5:1
compression)
Reads and writes data on 2176 tracks, 16
tracks at a time
Ultrium 5 WORM Burgundy and silvery
gray
1,500 GB (3,000 GB at 2:1
compression) Reads and writes data on 1,280 tracks,
16 tracks at a time
Ultrium 4 WORM Green and silvery gray 800 GB (1,600 GB at 2:1
compression)
Reads and writes data on 896 tracks, 16
tracks at a time
Ultrium 3 WORM Slate blue and silvery
gray
400 GB (800 GB at 2:1
compression) Reads and writes data on 704 tracks, 16
tracks at a time
1
The first set of tracks, which is 16 for Ultrium 6, 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 examples:
v
The format of a WORM cartridge is unlike that of standard read/write media.
This unique format prevents a drive that lacks WORM-capable firmware from
writing on a WORM cartridge.
v
When the drive senses a WORM cartridge, the firmware prohibits the changing
of user data already written on the tape. The firmware keeps track of the last
appendable point on the tape.
WORM media errors
The following conditions cause WORM media errors to occur.
v
Information in the servo manufacturer's word (SMW) on the tape must match
information from the cartridge memory module in the cartridge. If it does not
match, a full-high tape drive will post a media error code
7
on the SCD.
v Inserting a WORM tape cartridge into a drive that is not WORM-capable causes
the cartridge to be treated as an unsupported medium. The drive will report a
media error code
J
. Upgrading the drive firmware to the correct code level will
resolve the problem.
Requirements for WORM capability
The requirements to add WORM capability.
To add WORM capability to your LTO Ultrium generation 5 or generation 6 drive,
firmware must be at the correct code level, and you must use either Ultrium 5
1,500 GB WORM tape cartridges or Ultrium 6 2500 GB WORM tape cartridges.
Figure 9. Ultrium data cartridge on the left; WORM cartridge on the right
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IBM Half High LTO Ultrium Gen 6 Internal SAS Tape Drive: Installation and User's Guide