DAT 72 (Models 5242 and 5242ACL) Tape Drive User's Guide

Section 1: General Information
1.6.6 Write-Protecting a Cartridge
The tape cartridge has a write-protect switch that protects data cartridges from being overwritten.
To protect the cartridge, slide the switch all the way to the left. The hole will be visible. Data can
then be read from the tape but not written to it. Slide the switch to the right (covering the hole) to
write-enable the cartridge. Data can be written to and read from the tape.
Write Enabled
White Switch to the Right
Digital
Data
Storag
Label Side Up
Cartridge to be Loaded
in this Orientation
Write Protected
White Switch to the Left
Digital
Data
Storag
Label Side Up
Cartridge to be Loaded
in this Orientation
Figure 3 Write-protecting a cartridge
Caution
: The tape log, which contains a history of usage of the tape, is not updated when
the cartridge is write-protected. The tape log is invalid if a cartridge is used
when write-protected.
1.7 Labeled and Unlabeled Tapes
The 5242 and 5242-ACL tape drives can use both labeled and unlabeled cartridge tapes. A tape
label is a record at the beginning of a tape that identifies the tape volume and the files it contains.
An expiration date protects labeled-tape information from being accidentally overwritten. A
scratch tape is a labeled tape with an expiration data that has passed. If a tape has no standard
label, it is considered unlabeled. Nonstop servers support two standard tape-label formats:
 ANSI
 IBM-MVS
Note
: Because they can be cataloged and offer security features for protecting data, labeled tapes
should be used with the 5242 and 5242-ACL tape drives.
1.8 Features
1.8.1 Recording Technology:
 Helical scan tchnology
18.2 Capacity:
Typical Native Data
Capacity
Drive Type 5242 5242-ACL
125m cartridge DDS-3 12.0 GB 72.0 GB
170m cartridge DAT72 36.0 GB 216.0 GB
Table 3 Tape cartridge capacities
HP StorageWorks DAT 72 (Models 5242 and 5242ACL) User's Guide 3 HP Part Number 528296-003 July 2005