Quantum LTO-5 HH SAS C, Technical Reference Manual

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Chapter 2: Introduction
Speed Matching
Quantum LTO-5 HH SAS Model C User’s Guide 15
• Reads and writes Generation 5 and Generation 4
• Only reads Generation 3 cartridges
• Does not write prior generation format to current generation
cartridge.
The drive reads tapes that have been written by other licensed Ultrium 5
drives. It also writes to tapes that can be read by other licensed Ultrium
5 drives.
In addition to using the Quantum LTO Ultrium Data Cartridge with up to
1500 GB capacity, the drive also offers read/write capability for certified
LTO Ultrium tape cartridges.
Speed Matching
To improve system performance, the drive uses a technique called speed
matching to dynamically adjust its native (uncompressed) data rate to
the slower data rate of a server. With speed matching, the drive
operates at different speeds when reading or writing the Ultrium 4 or
Ultrium 5 cartridge format. Native data rates are as follows in the table
below.