LTO [Linear Tape-Open] history

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Linear Tape-Open

From Wikipedia, the free encyclopedia

Linear Tape-Open (or LTO) is a magnetic tape data storage technology developed as an open alternative to the proprietary Digital Linear Tape (DLT). The technology was developed and initiated by Seagate, Hewlett-Packard, and IBM. The standard form-factor of LTO technology goes by the name "Ultrium".

DDS [Digital Data Storage] history

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Digital Data Storage

From Wikipedia, the free encyclopedia

Digital Data Storage (DDS) is a format for storing and backing up computer data on magnetic tape that evolved from Digital Audio Tape (DAT) technology, which was originally created for CD-quality audio recording. In 1989, Sony and Hewlett Packard defined the DDS

OS Unix locations of the device files on the respective systems

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All you have to do is remember the locations of the device files on the respective systems. The following tables will help you do that for the most commonly used devices.

AIX File System Device Files

Block	Character
/dev/hd1	/dev/rhd1
/dev/hd2	/dev/rhd2
/dev/hd3	/dev/rhd3
/dev/hd*	/dev/hd*

HP-UX File System Device Files

Block	Character
/dev/dsk/c201d0s0	/dev/rdsk/c201d0s0
/dev/dsk/c201d1s0	/dev/rdsk/c201d1s0

SCSI Evolution

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SCSI Evolution

Common Name(s)	Maximum Speed (MB/second)	Signaling	Maximum Devices	Cable Lengths
SCSI-1	5	single-ended	7	up to 6m
SCSI-2 Fast SCSI	10	single-ended, high-voltage differential	7 15	up to 6m single-ended up to 25m differential
SCSI-3 Fast & Wide SCSI	20	single-ended, high-voltage differential	7 15	up to 6m single-ended up to 25m differential
Ultra SCSI	40	single-ended, high-voltage differential	7 15	up to 6m single-ended up to 25m differential
Ultra2 SCSI	80	low-voltage differential	15	up to 25m point-to-point up to 12m for multiple devices
Ultra3 SCSI or Ultra160 SCSI	160	low-voltage differential	15	up to 25m point-to-point up to 12m for multiple devices
Ultra320 SCSI	320	low-voltage differential	15	up to 25m point-to-point up to 12m for multiple devices