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Re: [ARSCLIST] Longevity of data tape?--
I was curious if you could elaborate further on your initial post:
"With digital audio tape the error only affects that portion of the
Which format of digital audio tape are you referring to? R-DAT/
Were you stating that you prefer digital audio tape formats to
Enterprise-class data storage tapes?
On Jun 9, 2005, at 4:52 PM, Jeffrey Kane wrote:
I don't believe I explained myself properly. Most backup
skip a bad block (or even several blocks) of data and continue the
What I describe arises when the corruption exceeds the ability of the
software to recover from errors. In that case, an entire file (or
not the whole tape depending on the location of the error) will be
unrecoverable. The validation of the archive/backup at the time
the initial process succeded. The problematic variable is between
and retrieval. With digital audio recordings, such errors will only
that portion of the recording unrecoverable.
As for error correction, that is a function of the format (AIT/LTO/
and software used for backup/archival. On 'trusting' a datatape to be
readable 25-30 years from now; I completely agree. That is the
recall being used when discussing longevity. In my case, I re-archive
critical material every three years. Data on tape IMO is far too
to corruption to be relied upon for a longer timeframe than that.
From: Association for Recorded Sound Discussion List
[mailto:ARSCLIST@xxxxxxx] On Behalf Of John Spencer
Sent: Thursday, June 09, 2005 2:47 PM
Subject: Re: [ARSCLIST] Longevity of data tape?--
This is an incorrect statement. There are various backup
applications that will skip a bad block of data and continue
the restore process, as well as applications that will report
on the quality of the data archive as it is being written.
Error correction is not a function of the data storage tape itself.
And I would never trust a data storage tape to be readable
25-30 years from now.
On Jun 9, 2005, at 2:36 PM, Jeffrey Kane wrote:
I've seen the figure 25-30 years bandied about for data tape. Data
backups are a double edge sword. They have better error
the data is more resilient. However, if there's anunrecoverable error
it renders ALL data for that particular file (and if it's in the
directory area, all data on the tape) unrecoverable. With digital
audio tape the error only affects that portion of the recording.