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Is verifying recommended when backing up onto a DAT72 tape?

I read in Wikipedia (http://en.wikipedia.org/wiki/Digital_Data_Storage) that in a DAT72 tape drive There are two read heads and two write heads. The read heads verify the data that has been written (recorded). If errors are present, the write heads rewrite the data.  If so, then is verifying the backup after writing necessary?  It seems there is a hardware verify built in.  Verifying doubles the time of the backup, halves the life of the tape and requires that the tape drive be cleaned more often.  I am wondering what is the standard practice out there?
Thanks.
Cliff
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kiwi_canuck
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kiwi_canuck
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TapeDudeCommented:
There IS hardware verification, and it does a good job with errors arising from bad media, but it can't pick up any tracking errors because the read and write heads are on the same plane.

If you're serious about your backups you'll always run a verification pass. It's a PITA for all the reasons you mention but it's worth it.
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kiwi_canuckAuthor Commented:
Thanks TapeDude...judging from your name you would know!  Anyone else want to share an opinion before I close this off?
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Thomas RushCommented:
I agree with TapeDude.
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kiwi_canuckAuthor Commented:
Thanks guys.
Cliff
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