Dne 20. 11. 24 v 2:28 "Thomas Brücker" napsal(a):
Dear Mr. Kabelac,
* I have had two (real!) cases which three mechanical harddisks, that have
had defective sectors (within warranty time!), not just announced as
defective, but really unreadable.
1st case: Two ecolocical, energy saving samsung disks, that have both got
unreadable sectors, happyly mutually not on the same location, connected
as raid1: All data could be read and saved.
2nd case: An usb-disk that had got unreadable sectors with a 'pseudo-raid'
on it: All data could be read and saved.
Hi
Any device that is showing 'error' sectors (aka smartctl shows badblocks,
uncorrectable errors) should be ASAP 'recovered/copied' to another new disk
- and such faulty disk should no longer be used for anything you care about!
If you think the disk is still 'good enough' to not be thrown to
trash/recycle bin - you could probably do a surface analysis - and i.e.
allocate partitions on a drive in such a way that HUGE portion of drive before
and after the error is left as not being used/allocated (works for HDD -
for SSD/NVMe this obviously makes no sense) - so then HDD reading heads are
not damaging those errori places any more - and then you can try to use it to
store something unimportant - i.e. 3rd. backup of something....
Using faulty drive as 'daily work disk' with the idea you've 'saved'
something makes no sense - you are just preparing yourself big troubles....
* Experimental case: Test of 'pseudo-raid' on a dvd, the dvd was scratched
and could partially not be read: The pseudo raid could be read without any
problem (
Just backup all your DVDs on TiB drives while they are still readable....
* I have had at least two (real) cases of harddisks with each having a
unreadable first sector (== the partition table): The laptops could
neither
Such drives are simply an electronic waste for recycling...
* So, for me, it is a good idea, to protect myself from defective sectors.
* 'Normal' raid(1):
* notebooks with two harddisks in it ...?
* travelling with a laptop and two usb-harddisks ...?
Seriously you should really use real raid1 instead of these rather highly
'questionable' data protection ideas... (if you care about your data)
And yes - all notebooks I know have at least 2 slots for drives - one is
typically equipped when being sold - other one is usually empty - one just has
to dismount laptop cover and add the drive to unused slot...
Regards
Zdenek
