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Hard Disk bit error rate


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#1 Milanov

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Posted 10 June 2013 - 02:21 PM

Dear forum,

My question is a bit general but I hope you can at least give some guidance.

Suppose I have an ordinary laptop with an HDD (I don't think there are any external shock sensors -- if you're interested I can post the HDDs info). I have a data partition on it which is regularly (once every 1-2 months) backed up on an internal desktop HDD in an external casing. This separate HDD is switched on only when the laptop HDD needs backing up, or when I need to restore something.

My question is the following:
Given that the filesystem on both devices is NTFS, what is the probability that randomly, a bit, or a set of bits will get corrupted (think ambient radiation/rapid movement/whatever-not-user-triggered)? Because then, since the backup utility doesn't know that this is an error, will copy it in the backup as well. Is there a way to keep track and prevent such errors? In the end, I have 350GB of serious stuff on it, and would hate it one day to have to access document X and find that it is corrupted..

Regards,
Milanov.

#2 Milanov

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Posted 10 June 2013 - 06:21 PM

In any case, here's what I've found in the meantime that answers my question:

https://engineering....ces_DSN2012.pdf
https://static.googl...sk_failures.pdf

http://serverfault.c...e-done-about-it
http://storagemojo.c...in-disk-drives/

Happy reading.

#3 fzabkar

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Posted 10 June 2013 - 10:42 PM

Most HDDs have shock sensors. You will usually find these at the corners of the PCB, angled at 45deg or 25deg. They are white in colour.

Laptop HDDs may also have a tri-axis accelerometer.

Murata ceramic shock sensors:
http://www.farnell.c...heets/58860.pdf
http://www1.futureel...PKGS-00LD-R.pdf

KXPB5, Kionix, Tri-axis Accelerometer:
http://www.kionix.co...oduct Brief.pdf
http://www.kionix.co...tions Rev 3.pdf
http://www.kionix.co...tions Rev 3.pdf
http://www.kionix.co...eter-KXPB5.html

#4 cbrworm

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Posted 13 June 2013 - 01:24 PM

My best advice is to keep archives. Whether it be weekly, monthly, yearly - whatever. Keep old copies that you can refer to. Ideally store a copy at a different location.

#5 FastMHz

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Posted 13 June 2013 - 05:37 PM

Yes, archives are the way to go. You could keep multiple copies of your data in archives and have PAR2 volumes to correct any lost bits if they ever occur. RAR is good, but 7Zip is open source and what I prefer for archives.

Edited by FastMHz, 13 June 2013 - 05:44 PM.

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#6 continuum

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Posted 21 June 2013 - 03:02 PM

If you're that worried, use PAR2 for your archives. No substitute for an archive forum that allows for this sort of thing.



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