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Date:      Sat, 19 Dec 1998 17:08:15 +1030
From:      Greg Lehey <grog@lemis.com>
To:        Gary Kline <kline@tera.com>, questions@FreeBSD.ORG
Subject:   Re: 4mm tape drive question
Message-ID:  <19981219170815.K24125@freebie.lemis.com>
In-Reply-To: <199812190549.VAA17445@athena.tera.com>; from Gary Kline on Fri, Dec 18, 1998 at 09:49:22PM -0800
References:  <199812190549.VAA17445@athena.tera.com>

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On Friday, 18 December 1998 at 21:49:22 -0800, Gary Kline wrote:
>
>
> 	When I bought my 4mm tape drive in '95, 2GB was a _lot_
> 	of storage; but since I've just added a 9G drive to
> 	my main system, it's time to consider the backups.
>
> 	My question:  can I use a cassette   larger than  90meter
> 	ones I've been using?  (And why?)

Yes.  But it may not do what you think.  I'm guessing (since you don't
say) that your tape drive is a DDS-1 model.  A DDS-1 tape drive can
only write in DDS-1 format, which would put 33% more on a 120m tape
than on a 90m tape.  120m tapes are usually written in DDS-2 format,
which would put 100% more on them than on a 90m tape.  More
importantly, if you change your DDS-1 tape drive for a DDS-2 one in
the future, you may not be able to read the tapes.

Greg
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