Exabyte 221L, Product Manual

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184
P
RODUCT
M
ANUAL
1014258
A
PPENDIX
B—W
RITE
O
NCE
, R
EAD
M
ANY
(WORM) C
APABILITY
Table B-1 lists WORM media specifications.
D
ATA
S
ECURITY ON
WORM M
EDIA
Certain built-in security measures help ensure that the data written on a
WORM cartridge does not become compromised, for example:
The format of an IBM Ultrium 3 400 GB WORM Tape 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 tape cartridge.
When the LTO-3 tape drive senses a WORM cartridge, the firmware
prohibits the changing or altering of user data already written on the tape.
The firmware keeps track of the last appendable point on the tape.
WORM M
EDIA
E
RRORS
The following conditions cause WORM media errors to occur:
Information in the servo manufacturer’s word (SMW) on the tape must
match information from the cartridge memory (CM) module in the
cartridge. If it does not match, a media Error Code 7777 will post on the
LTO-3 drive’s single-character display (SCD).
Inserting a WORM tape cartridge into a tape drive that is not compatible
with WORM causes the cartridge to be treated as an unsupported medium.
The tape drive will report a media Error Code 7777 .
Only LTO-3 tape drives have WORM capability. Inserting a WORM
cartridge into an LTO-2 or an LTO-1 tape drive will produce the above
error.
If you are using an LTO-3 tape drive and receive the above error,
upgrading your LTO-3 tape drive’s firmware to the correct code level
will resolve the problem. The firmware must be at version 54xx or higher
and is available as a free download at www.exabyte.com/downloads .
Table B-1 WORM tape cartridge specifications
Tape Cartridge Case Color Native Data Capacity
Ultrium 3 WORM Two toned colored cartridge
a
400 GB (800 GB at 2:1 compression)
a
The two-toned coloring allows you to easily distinguish WORM cartridges from Write/Read cartridges.