zak2011 wrote:Western Digital My Book 4TB ext drive
Gostev wrote:zak2011 wrote:Western Digital My Book 4TB ext drive
Keep in mind that consumer hard drives have very high URE (Unrecoverable Read Error), and most people do not realize how high it is. Here is the rule of thumb on how much data you need to read from the storage medium before running into an unrecoverable read error:
Consumer SATA > 1 error per 10 TB
Enterprise SATA > 1 error per 100 TB
Enterprise FC/SAS > 1 error per 1 PB
Tape (LTO) > 1 error per 10 PB (if handled properly)
Tape (Enterprise) > 1 error per 1 EB (if handled properly)
This means that in your case, if you write 4TB backup file to your storage, and immediately read it back twice (for example first to test, then to perform actual restore), you will get on average 1 corrupted bit, and thus infamous CRC error on restore.
For home NAS, this is completely irrelevant, because you will not notice a bad bit with photos, music or videos (and there is no CRC validation on those). Where this becomes an issue is with software that does not trust the storage, and checksums all the data it deals with (such as data protection software).
I read that the file 'vib' has two indices, correct?
I believe that have only damaged the 1st Mb of the files.
Nevertheless, without correct meta it is hardly possible to make any sense of that data. If the second instance of meta had survived, you wouldn't see the word "All" in the error message.
PTide wrote:Well, apparently both of them are gone. If they are not, then why would the message clearly say that "All instances of the storage metadata are corrupted" ?
PTide wrote:Also please tell us what is that "VeeamR" tool that you are referring to, where did you see it?
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