Tape storage, high and low, gets more dense

Two classes of tape storage are jumping to higher densities this week, potentially saving time and money at enterprises as well as small and medium-size businesses.

Hewlett-Packard and Sony on Tuesday announced a coming generation of DAT (Digital Audio Tape) media with twice the capacity of the current technology and a higher transfer speed. On Monday, Sun Microsystems introduced an enterprise-class tape drive that can pack 1T byte on a current type of tape, and on Tuesday IBM also announced a 1T-byte tape drive system.

Along with demand for hard-drive storage that has to be immediately accessible, the need for tape to reliably back up and archive older information is growing fast, according to IDC analyst Robert Amatruda. Higher capacity per tape cartridge can save space, power and money and even allow companies to save more old data, he said. In addition to greater density, the new tape technologies offer faster transfer speeds.

The next generation of DAT, called DAT 320, will be able to hold 320G bytes of data on one cartridge. It was jointly developed by HP and Sony over the past two years and should be generally available in the first half of next year, according to Bob Conway, manager of the tape product marketing team at HP. The new technology will also allow for back up from disks at speeds as high as 86G bytes per hour with 2:1 data compression, he said. Data is typically transferred to DAT decks via USB (Universal Serial Bus) or serial or parallel SCSI.

DAT was introduced in 1989 and is still used for audio recording by broadcast professionals, but the market for DAT data storage is quite large, IDC's Amatruda said. Worldwide revenue hit US$575 million last year, according to IDC. HP and Sony co-developed the first four generations of DAT but then pursued separate technologies for several years, Conway said. Continued consolidation in the tape industry helped drive them back together for the development of DAT 320, he said.

To achieve the new density on a tape the same size as its predecessor, DAT 160, the companies changed the basic formula of DAT for the first time, from metal particle tape to metal evaporated tape. They also developed narrower tracks, Conway said. The companies will license the DAT 320 technology to anyone for a nominal fee.

HP and Sony's openness will help ensure there are multiple suppliers of media and components, Amatruda said. HP made 55 percent of low-end tape deck shipments worldwide in the first quarter of this year and Sony made 7 percent, he said.

Although there are a growing number of external hard-drive products available for SMB backups, they aren't as reliable as tape, he said.

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