HP NonStop G-Series - Manual (Page 14)

5157/5157 ACL S-Series DLT Subsystems Installation/Users Guide
Overview and Features of the 5157/5157 ACL S-series Subsystem
1-3
1.3.2 Product Overview for the 5157/5157 ACL Drives
The DLT 5157/5157 ACL tape drives are a high-
performance, high-capacity, streaming cartridge tape
product designed for use on midrange and high-end
computing systems. Using data compression and
compaction, the DLT 5157/5157 ACL tape drive features a
formatted capacity of 70.0 GB and a sustained user data
transfer rate of 10.0 MB/s*.
The DLT 5157/5157 ACL tape drives are a 5-1/4 inch form
factor, half-inch tape drive. The design includes a quad-
channel read/write head, Digital Lempel-Ziv (DLZ) high-
efficiency data compression, and tape mark directory to
maximize data throughput and minimize data access time.
*Assumes 2:1 Compression ratio (Data Dependent)
1.4 Fast Data Transfer Rate
Used for unattended backups or archiving, the DLT
5157/5157 ACL tape drive allows the user to back up a
higher data capacity at a higher speed than earlier
products. The DLT 5157/5157 ACL tape drives, when
operating in a non-compressed mode, have a maximum
transfer rate of 5.0 MB/s. When operating in the
compressed mode, the maximum transfer rate is
10.0 MB/s.
1.5 High-Capacity
The DLT 5157/5157 ACL tape drives accept the
DLTtape

IV cartridge. When this cartridge is used, the
amount of data stored on the tape can be up to 35.0 GB
non-compressed or 70.0 GB of data using the compression
mode. The actual amount of this data stored in the
compression mode is dependent on the data type.