" What is a problem is when the number of bad sectors keeps steadily increasing over time. " Other than that, you're chasing perfection where none is to be found :) " On a single drive with no redundancy I agree but that's exactly why people run mirrors or Raid 5/6 which is why I run ZFS Raid-Z2 to detect and fix these problems on the fly. " except for the fact that you have actually lost data at this point. " Having a number of bad sectors isn't really a problem. " except for the fact that you're at risk of data loss. "Having a number of "weak" sectors isn't really a problem. If its a "weak sector" and struggles to still manage to read the data after 30-120 seconds of the drives "deep recovery" process then as I understand it no reallocation is still done either way and the sector limps along until it probably finally fails, there are programs that do check for this and I think they rewrite the file that has this problem but as far as I know reallocations on reads are very rare assuming they ever happen at all. If its out of those then it will notify the operating system of a write failure and in the case of Windows NTFS it will mark that sector as bad and immediately write that data to another sector somewhere else on the disk. If it fails altogether it doesn't get reallocated on a read as it doesn't know what data is stored there and at best its marked "sector pending reallocation" in the hope that subsequent data is written to it and obviously in that situation where you're writing over a sector you don't care what was there before and in that case the new data will be rewritten to that sector and if there is an error the drive will automatically reallocate it if it still has any of the couple hundred spare sectors it started out with. Other than that, you're chasing perfection where none is to be found :) What is a problem is when the number of bad sectors keeps steadily increasing over time. Having a number of bad sectors isn't really a problem. Having a number of "weak" sectors isn't really a problem. And the last 0.0001% of the time, well, then you're actually boned. Another 0.0001% of the time, the filesystem/operating system will intercept these errors and take care of it for you. All "weak sector" means is there was a CRC check failure somewhere along the line and the disk will go back and check again, at which point, one of two things will happen - it'll pass the test and no longer be considered "weak", or it'll fail and be marked as bad and reallocated.ĩ9.9998% of the time, the error correction system on the drive itself will intercept these problems and take care of it for you. I mean, bad sectors are kind of just a fact of life, and "weak" sectors aren't necessarily an indication of anything serious at all. Just make sure to tag the post with the flair and give a little background info/context. On Fridays we'll allow posts that don't normally fit in the usual data-hoarding theme, including posts that would usually be removed by rule 4: “No memes or 'look at this '” We are not your personal archival army.No unapproved sale threads, advertisement posts, or giveaways.No memes or 'look at this old storage medium/ connection speed/purchase' (except on Free Post Fridays).Search the Internet, this subreddit and our wiki before posting.R/DataHorader 2013-2023 Searchable Archives Historic Reddit Archives & Download Tools, Etc.ģ.3v Pin Reset Directions :D / Alt Imgur link And we're trying really hard not to forget. Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Timetm). government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Among us are represented the various reasons to keep data - legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g.
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