M8 cartridges that are inadvertently initialized at the L7 density can continue to be read and written in
LTO7 and LTO8 tape drives. However, they remain limited to the 6 TB native capacity.
In any tape product with M8 cartridges, the minimum LTO8 tape drive îš´rmware version is HB82.
Capacity Scaling
You can control the capacity of data cartridges to obtain faster seek times.
To control the capacity of the cartridge (for example, to obtain a faster seek time) issue the SCSI
command SET CAPACITY. For information about this command, refer to the IBM Ultrium Tape Drive
SCSI Reference.
WORM (Write Once, Read Many) cartridges
Certain records retention and data security applications require a Write Once, Read Many (WORM)
method for storing data on tape.
The LTO Ultrium 4 and later drives enable WORM support when a WORM tape cartridge is loaded into the
drive.
WORM media
The standard read/write media are incompatible with the WORM feature so a specially formatted WORM
tape cartridge is required, see Figure 96 on page 204. Each WORM cartridge has a unique, worldwide
cartridge identiîš´er (WWCID), which comprises the unique CM chip serial number and the unique tape
media serial number. For more information about how to choose and purchase the appropriate WORM
tape cartridges for your tape drive, see the section on ordering media supplies.
Figure 96. Ultrium Data and WORM Tape Cartridges
Data security on WORM media
Certain built-in security measures help ensure that the data that is written on a WORM cartridge does not
become compromised.
For example:
• The format of an Ultrium WORM Tape Cartridge is not the same as the standard read/write media.
This unique format prevents a drive that lacks WORM-capable îš´rmware from writing on a WORM tape
cartridge. For LTO 9, native data capacity is 18 TB and compressed data capacity is 45 TB.
• When the drive senses a WORM cartridge, the rmware prohibits the changing or altering of user data
that is already written on the tape. The îš´rmware notes the last point on the tape that can be appended.
WORM media errors
Several conditions can 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 posts on the
drive's single-character display (SCD).
IBM Conîš´dential
204IBM TS4300 Tape Library Machine Type 3555: User's Guide
To Next Page
Loading...
Need help?
General
