On 05/11/17 10:02, Felix Miata wrote:
Wols Lists composed on 2017-11-05 09:24 (UTC):
Felix Miata wrote:
Follow-up: I got the new HD installed using the image file created by dd_rhelp. The DVDR's title menu lists all recordings as it listed before, and makes new recordings successfully, but apparently dd_rhelp was more accurate with its 99.99% report than with 100.00%. The recording that the DVDR locked up playing has an 11 second loss/bad spot at the same place.
Yup. So you've saved everything else - good. And that'll now last another 7 years :-
I won't know everything else is good without watching all 100+ hours in real time. :-(
20906 hours powered up equates to only about 2.4 years of constant on.
Was that recording an old one made when the disk was nearly new? If the DVDR couldn't read it, I'm not surprised ddrescue couldn't either. If SMART doesn't report any problems on the drive, it should be safe to format and re-use it - I guess the magnetism on that one block just faded too much over time ...
Had you read the link in the post you replied to you should have noticed the disk would have been far from new when that recording was made, possibly at around 14426 hours or 20 months disk on time. The SD DVDR that the disk is in offers no evidence that it employs Smart technology.
Ah. I see. But even so ...
Earlier in this thread I showed Smartctl reported 131 pending sectors and reallocated sector count of 0. It's the second of the very same model in identical service here, the two being manufactured less than 90 days apart. I consider the old HD junk at this point, and likely most if not all of that model from that period.
imho you're throwing away a teenager of a drive ... I'll explain why. Firstly, do you understand what a "pending relocation" is? Yup, that's at 131, but I'd be far more concerned about that figure if it was the "reallocated sectors" figure. I had a look at the WD Green spec sheet. It comes with a 2-year warranty, so yes, assuming the drive is used 8 hours a day it's probably well outside its wall-clock warranty, but it's only been powered up just over it. The drive also is rated at 300K spin-up cycles. If your typical program is 30mins, that means you've used about 40K. Just over one tenth, which is why I describe the drive as a teenager. (And you've probably used rather less.) Pending relocations say absolutely nothing about the health of the drive, although they are bad for your data ... all it means is the drive can no longer read the sector, which could be anything from a stray cosmic ray, to a tired recording, to a power surge moving the actuator, to flaking oxide presaging a head crash. Anything. Humour me. "dd if=/dev/zero of=/dev/wdgreen". Your pending sectors WILL go back to zero - trust me. If relocated sectors goes up, then yes that is cause for concern, but there's every likelihood they will stay at zero. The drive cannot correct pending sectors by itself, it needs the computer to attempt to write to them. If the write is successful, it clears the error. If the write is unsuccessful, it relocates the sector elsewhere (which is the point at which you start worrying about the health of the drive). Cheers, Wol -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org