Filter
Top Products
130
PRODUCT MANUAL 1012581
APPENDIX B—WRITE ONCE, READ MANY (WORM) CAPABILITY
Ta bl e B -1 lists WORM media specifications.
DATA SECURITY ON WORM MEDIA
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 MEDIA ERRORS
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, the tape drive will report a Media Error code.
If your backup application or operating system returns SCSI sense
information, the Sense information will be Sense Key (03) Medium
error.
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 7
77
7.
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.