Date: Sun, 2 Aug 1998 09:02:17 +0200 From: Gunnar Flygt <gunnar@pluto.sr.se> To: FreeBSD Questions <questions@FreeBSD.ORG> Subject: Re: CD writers as a backup medium Message-ID: <19980802090217.A7786@sr.se> In-Reply-To: <199808011938.PAA10383@icarus.eng.mindspring.net>; from David Mayne on Sat, Aug 01, 1998 at 03:38:01PM -0400 References: <19980801144333.A12731@fcc.net> <199808011938.PAA10383@icarus.eng.mindspring.net>
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On Sat, Aug 01, 1998 at 03:38:01PM -0400, David Mayne wrote: > > > On Sat, 1 Aug 1998, Nathan Dorfman wrote: > > > > A 90 meter DAT tape can hold up to 4 gigs per tape. You can get them > > for about $9 a piece, according to people who buy them. You'll need > > 6 CDs to back up 4 gigs on CD, that's $6-9. Use the DAT tape twice > > and you've already gotten your money's worth. A good CD-R drive is > > $400 (SCSI). How much is a SCSI DAT drive, anyone? Plus, I'm not > > even mentioning that you can buy 120m tapes for only a few dollars > > more. > Unfortunately, DAT tapes are extremely fragile, can be used only > a few times, and can be stored in the best conditions (cool, dust > free) for only about a year without risking data loss. The pattern > written to the tapes is so tight that you may have bleed over affect > with the bits after that year is up. DLT's write a nice wider format, but > are very expensive. QIC drives are available from tandenbergdata.com > which offer the best long term storage capability, and you can get > them up to 5GB, and the drives can be had for around $500 refurbished. A small correction there. Tandberg tapes can store 16GB of data. We have several of them at my company. > Unfortunately, the media is about $35 a tape, but they can be > written to many times, and will store for 5-10 years. > If you have data that has to be backed up daily, and want the backup > to last more than a year, I would suggest QIC. CD's could be useful > if you only need to do backups periodically (such as once a month). > DAT tapes - in my experience, don't use one more than 5 times, and > prepare to have data loss after a year or so, so a once yearly > CD burn may be in order. > Regards, > David > dmayne@mindspring.net > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-stable" in the body of the message -- regards, Gunnar email: flygt@sr.se To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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