This is DAT-vs.-8mm+NeXT in view mode; [Up]
Date: Sun 19-Dec-1991 05:55:52 From: pyrros@cis.udel.edu (Christos T. Pyrros) Subject: Re: DAT vs. 8mm & NeXT In article <1991Dec19.012350.16182@news2.cis.umn.edu> scott@cameron.geom.umn.edu (Scott S. Bertilson) writes: >In article <1991Dec11.002455.21576@bbs.comm.mot.com> steveho@ecs.comm.mot.com (DX536 Steve Hoffman) writes: >> From: Steve_Jobs@NeXT.COM >> To: steveho@ecs.comm.mot.com (DX536 Steve Hoffman) >> >>Steve, >> >>Most of the industry is moving to DAT tape for backup. This is >>because one DAT tape can hold up to 4 GB of data, unlike the >>120-256MB capacity of the optical disk media. This is quite superior > > I may be mistaken because I haven't looked at DATs for awhile, but I chose >to use the Exabyte because the DAT gets 4 GB only with data compression (it >approaches 2 GB with extra long tapes and no compression). The Exabyte 8200 >gets 2 GB without compression and the 8500 gets 5 GB without. There are vendors >who sell compression add-ons for Exabytes that will get you up to around 10 GB. The HP35480A, which I bought from Tecor for less than $1700, has built-in compression, and claims an 8 Gig capacity on a 90 Meter tape. The 90 meter tapes do 2.0 Gig without compression, and can be found for $14.50 each (DATA GRADE, this is critical). The 60 Meter tapes hold 1.3 gig without compression, and 5 gig with compression, and can be found for $11.50 each. True, DAT is more expensive than 8mm ($6.50 for a 2 Gig tape from the same source) but I feel that the benefits of DAT merit the extra cost. Many say DAT is more reliable. I don't know about this. DAT is a smaller and better designed media (better case, etc). DAT is a standard, and the new HP compression chip is rumored to become a substandard in 3rd party DAT drives. With the HP35480A, my backup rate is 10.5 Megs/minute, just under the manual-claimed rate of 11 Megs/minute. I have a NeXTstation w/20 Megs RAM and a Wren 7 (1 Gig formatted). I'm backing up 600 Megs. And it works perfectly. I don't work for HP, Tecor, or NeXT, etc, etc, etc.... or the government.... or ___________________. Chris
Date: Sun 19-Dec-1991 12:28:37 From: rwt@ohm.york.ac.uk (Richard Taylor) Subject: Re: DAT vs. 8mm & NeXT In <72463@nigel.ee.udel.edu> pyrros@cis.udel.edu (Christos T. Pyrros) writes: >The HP35480A, which I bought from Tecor for less than $1700, has built-in >compression, and claims an 8 Gig capacity on a 90 Meter tape. The 90 >meter tapes do 2.0 Gig without compression, and can be found for $14.50 >each (DATA GRADE, this is critical). The 60 Meter tapes hold 1.3 gig >without compression, and 5 gig with compression, and can be found for >$11.50 each. ...... >And it works perfectly. I agree - we just plugged it in (or rather our system manager did) and off we went, great. Richard
Date: Sun 19-Dec-1991 20:08:24 From: sherwood@space.ualberta.ca (Sherwood Botsford) Subject: Re: DAT vs. 8mm & NeXT Richard Taylor writes [ About HP DAT ] > > >And it works perfectly. > > I agree - we just plugged it in (or rather our system manager did) > and off we went, great. > > Richard > > -- And on the flip side we have 2 exebyte tape drives from Dilog, that have been nothing but grief since we got them. They return "ready" before they actually are; a forward space file command has only about 95% chance of working. Errors occur at odd intervals. My backup script is full of checks, and retries, and restarts. (Thanks to perl, it at least works. I couldn't write it in csh)
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