HP 330834-B21 - StorageWorks Ultrium 460 Tape Library Drive Module, Техническое справочное руководство

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42 Glossary
Ultra SCSI supports both SE and LVD interfaces. Ultra2 SCSI supports LVD
interfaces only. In normal situations, slower devices can coexist with faster
devices, and narrow devices can be used on the same SCSI bus as wide
devices using a suitable adapter.
HP’s Ultrium drives are Ultra2, wide SCSI-3 compatible devices. They can be
used with both LVD and SE host bus adapters.
sequential access Sequential access devices store data sequentially in the order in which it is
received. Tape devices are the most common sequential access devices.
Devices such as disk drives are direct access devices, where data is stored in
blocks, not necessarily sequentially. Direct access allows for speed of
retrieval, but is significantly more costly.