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Re: [ARSCLIST] huge number of links on digital preservation
Hello, Ron,
I'm too swamped with moving around gigabytes of audio and deadlines
to get deeply into this, but there is a huge dichotomy out there
which may be reduced in the future, but it's the cost per GB of raw
consumer-level hard drives and the cost per GB per year of managed
storage. The cost of consumer hard drives for a given amount of
storage is a small percentage of the cost per GB per year of managed
storage. I don't have a precise percentage, but it's in the
neighbourhood of 5-10%, maybe less.
So those of us who look at hard drive costs from CDW or Amazon or
NewEgg and then go to buy a finished storage system end up with
sticker shock on the storage system.
I'm not sure where all this is going, but, long term, even the
managed storage will drop.
LTO tape is inexpensive, but one LTO drive will cost about as much as
I have invested in a triple-redundant 1250 GB hard-drive storage
system. It costs me about $3/GB to add storage to it (in 250 GB
lumps). I can easily triple it before I run into brick walls--as long
as I look at it as 250 GB (or 500 GB) chunks, and don't try and
manage it as a 3 GB single file system.
Cheers,
Richard
At 11:12 PM 2006-12-09, Ronald W. Frazier wrote:
Hello all,
(Please forgive cross postings.) After reading Mikes reply to my
How CD's and DVD's can fail article, I've been doing extensive
research into CD and DVD media which lead me into studying digital
data archiving. I'm going to be modifying my article to correct
some of the errors Mike pointed out. The field is so broad, my head
is spinning. The one conclusion I came to is that, to really
preserve digital data, takes lots of technology and manpower and
planning. One document I read, either from the British Library or
the British Archives (can't remember which) cited a digital mass
storage system that they have. They ingest enormous quantities of
data. I saw a chart which estimated their average cost of
maintaining the system and administration over 5 years to be close
to 9 EUROS PER GIGABYTE! That translates to $12.12 at the current
exchange rate. This is an astounding cost. This means the cost of
archiving the data from a standard DVD movie, 4.7 GB, for 5 years,
would be 42.3 Euros or $56.97 at the current exchange rate! It
would be cheaper to just buy a couple of movies from the publisher
every 5 years. Of course, with most digital data, you don't have
that luxury. Anyway, this cost factor really surprised me,
considering the almost negligible cost of the storage media
itself. I also saw a proposal for a data storage system for audio
visual materials for an agency affiliated with the US National
Archives which is planning to ingest, get this, 23 TERABYTES PER
DAY! That's 23,000 GB / day. So, combining these two figures, it
would seem that this US agency would need to budget $12.12 * 23,000
= $278,760 / day to cover their 5 year data storage costs. This
works out to about $99 Million / year. That sure sounds like a lot
to me. In your experience, does that sound correct?
Richard L. Hess email: richard@xxxxxxxxxxxxxxx
Aurora, Ontario, Canada (905) 713 6733 1-877-TAPE-FIX
Detailed contact information: http://www.richardhess.com/tape/contact.htm
Quality tape transfers -- even from hard-to-play tapes.