Quiz

Storage Smarts Answer #34: Helical scan

Storage Smarts

QUESTION OF THE WEEK:

This is a way of recording information onto magnetic tape. It was used to record TV programs in the 1960s, and has been used in high-end tape-backup products. It's also the same technology used in digital audio tapes.
a. port scan
b. linear
c. optical
d. helical scan
e. Vera (Vision Electronic Recording Apparatus)

Were you correct? This week's answer is:
d. helical scan

Learn more:

Helical scan is a way of recording information onto magnetic tape. It was used to record TV programs in the 1960s, and has been used by several storage vendors (including IBM, Exabyte, StorageTek and others) in their high-end tape-backup products. It's also the same technology used in digital audio tapes (Digital Audio Tape).

Helical scan began in the VCR world and uses a spinning read/write head and diagonal tracks. But the recording and playback heads touch the tape, and an IBM scientist concluded in the mid-1990s that helical-scan cartridges can start to deteriorate after being used from 50 to 250 times. For this reason, IBM introduced its follow-on to helical scan in 1995. Called linear technology, it doesn't store as much data as helical scan but the heads don't touch the tape. Helical scan remains a viable option for high-capacity tape backup.

For more information:

Helical scan vs. linear: Comparison of helical-scan and linear recording technologies

Sony tape drive could subtly shift storage strategies

Ask W. Curtis Preston your backup and recovery questions.

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This was first published in November 2002

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