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It would seem that my data drive is starting to develop bad sectors. I installed a trial version of HDTune Pro 4.60 earlier today after noticing a problem. See screenshot.First it was just 'Current Pending Sector Count' and after, then running Western Digital Digital 'Data Lifeguard Diagnostic for Windows' which gave the OK.see second screenshot.A subsequent reboot, is showing that the problem is unfixed.
It is now showing 'Uncorrectable Sector Count', also. See last screenshot.Is there anything I do can to locate the bad sectors and remove them. There are 3 only? You don't remove bad sectors. A bad sector is bad and needs to be marked as such so that it is not used to store data.
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It is normal for drives to have a few bad sectors, but they should be marked at the factory so they are never used. If your drive is developing more bad sectors, it is a sure sign it is time to backup all your data and start shopping for a new drive.You can do low level formats with programs like and that may delay the inevitable, but a drive that keeps creating bad sectors is failing. I don't know about vista/7, but in XP/2k, you had the option on install to do what was called a 'full format' or a 'quick format'.
I have read and been told that a 'full format' maps out the bad areas so that they are not used, and a 'quick format' did not do this. I was told for sensitive info on servers etc, to ALWAYS do a 'full format'.If the drive is continuing to develop bad sectors, I would replace it.
If it is not, then a reformat might be the only option. SpinRite works, I have used it.
So does MHDD (I think that is the name of it) to a degree, if you can decipher how to use it.Anyone know 'for certain' if those formatting differences are how I explained? And what does vista/7 do? There is no option for a 'full format' and how quickly it formats drives, it is nothing compared to XP/2k on 'full format', more like 'quick format', or even faster.Sul. Click to expand.Those are the primary differences but a full is not just for sensitive information on servers. Even on PCs you should always use full unless you know for certain the hard drive is good and has already been formatted. You cannot use quick on an unformatted drive.Neither a full or quick will check previously marked sectors to see if still bad.
And a format will not prevent a sector from going bad. And finally, a common misconception is thinking a format of any kind will delete, erase, cover up, or 'wipe' any previously saved data. The data is still there and can be recovered with readily available recovery software.
It can be assumed then that once a sector is marked as being 'bad' it is more or less permanent then? What would the best method be to check for 'new' bad sectors and mark them? Is it possible (without spinrite) to do so without losing data?Right, format only maps the bad sectors so data won't be written there, which does prevent data from being written to a bad area, so one might consider it will prevent data loss, to a degree.Do programs that raise/lower every bit (read/write - 0/1) actually destroy data so that forensics can no longer retrieve it?Sul. Click to expand.No not true. It has always been that just a few passes is enough in the vast majority of cases. In fact, just one pass will rearrange every particle preventing most recovery programs from determining what was there, thus preventing the accidental discovery of previously saved data.
So in reality, if you want to give away a drive or computer, deleting everything off the disk, then filling it up with music files, then deleting everything again will likely be good enough. And as soon as the new user begins using the disk again, recovery becomes even less likely.That said, if there is a chance a professional badguy (or well funded law enforcement agencies) with very sophisticated (and expensive) forensic recovery hardware and software is able to get a hold of your disk and there was something on it you don't want discovered, using a 'wipe' program like DBAN, or my favorite, would still be a wise precaution. But note in those cases, the drive's own read/write heads are inadequate and the drives are disassembled and the platters read individually in very sophisticated specialized equipment in an attempt to read and 'residual' magnetic orientations of the particles. This is why data recovery services, should you accidentally format your drive or delete something important can cost $1000s, and why only a dedicated, well funded badguy would still be a threat. So unless you are specifically a target of bad guys, you don't have to go to extremes. A physical bad sector is caused by an impurity or imperfection in the platter. It cannot be fixed.
A logical bad sector is marked bad because the low level formatting at the factory could not format the sector for some reason. If another program, such as Spinrite is used, and is given time (time the factory does not want to use) and is able low level format the sector, it may be recovered. Note the factory is willing to spend just a few minutes per drive. Spinrite will spin hours or longer, if you allow. It has always been that just a few passes is enough in the vast majority of cases. In fact, just one pass will rearrange every particle preventing most recovery programs from determining what was there, thus preventing the accidental discovery of previously saved data.
So in reality, if you want to give away a drive or computer, deleting everything off the disk, then filling it up with music files, then deleting everything again will likely be good enough. And as soon as the new user begins using the disk again, recovery becomes even less likely.That said, if there is a chance a professional badguy (or well funded law enforcement agencies) with very sophisticated (and expensive) forensic recovery hardware and software is able to get a hold of your disk and there was something on it you don't want discovered, using a 'wipe' program like DBAN, or my favorite, would still be a wise precaution. But note in those cases, the drive's own read/write heads are inadequate and the drives are disassembled and the platters read individually in very sophisticated specialized equipment in an attempt to read and 'residual' magnetic orientations of the particles.
This is why data recovery services, should you accidentally format your drive or delete something important can cost $1000s, and why only a dedicated, well funded badguy would still be a threat. So unless you are specifically a target of bad guys, you don't have to go to extremes. Click to expand.Please go back and note what I said!
I said, a few passes is enough in the 'vast majority of cases'. I did not say all cases.
And I said, a single pass is enough to prevent ' accidental discovery of previously saved data'. I did not say it will prevent discovery from a determined effort.But to your claim, a few passes with what? It could not have been a true 'wipe' program. And with what recovery program?Understand that data is written to a drive by aligning the magnetic particles into what is basically a North and South, or East and West orientation representing 1s and 0s. When you write to a sector, you change the orientation of the particles in that sector. When using the drive's own head and on-board controller (which all but specialized forensic recovery equipment does) to read the sector, it will only pick up the strongest magnetic fields, representing the most recent write. In order to recover data from a sector that was overwritten, even once, you have to disassemble the drive, bypass the drive's own controller board and use a specialized 'forensic' controller to read the extremely tiny residual magnetism found 'under' the currently saved data in the sectors and you have to have a program that can isolate that minute information.
And in extreme cases, you have to disassemble the platter stack and mount the platters into special equipment with specialized heads. So once again, this is using professional recovery services to hopefully recover accidently deleted/formatted drives can cost $1000 - it takes highly trained people using very specialized and expensive equipment - not something you likely have on your shelf.Therefore, if a true 'wipe' program was used, it is programmed to hit every sector and not skip a single one. And typical file recovery (not 'forensic' recovery) programs use the motherboard's IDE or SATA controllers, the drive's own controller board, and the drive's own read/write heads to bypass the MFT and FAT (for older drives) to read and access data directly. Recovery programs do NOT read underlying residual magnetism. So I'm sorry, but I find it hard to believe you were able to recover any previously saved data, especially after 'few' passes, IF it was wiped with a true wipe program, unless you have access to very expensive forensic recovery equipment. Click to expand.I would agree. When I have a drive that is giving issues, it no longer is used to hold important data.
I use them for my kids computers to game on and stuff like that until they give up, or I send them in if they can be RMA'd. But I don't personally trust any drive that has been Remanufactured. Had too many that I trusted that did not last like they should.My motto is if it is important, it had better be on flash, optical or 'newish' drives in a mirrored raid array. If it isn't on one of those, then to me it isn't safe.
All depends on how critical your data is to you.Sul. Click to expand.Note I said, 'If your drive is developing more bad sectors.' But to your point, you are right, this could have been a 'glitch' - perhaps caused by a sudden power failure (get a good UPS with AVR) or the drive was bumped at the wrong time and perhaps it will give you years of error free service. But perhaps not.
The issue then becomes how much you wish to trust this drive to protect your data. For some, the data is of little concern. For others, including me, the loss of my data is worth many times more than the cost of a whole new computer. I keep current backups but should my main drive fail, it will still amount to substantial downtime until I have everything fully restored.
That lost time means lost productivity and when unscheduled, it can be very disruptive. I would much rather replace the drive at my time of choosing rather than rolling the dice, crossing my fingers, and pray all goes well. I mean when you can get a, why risk it?As for that same ATA channel 'issue', note it is not an error. It just means you have two HDs on the same IDE cable. You typically get better drive performance if you put a single HD per cable, putting any optical as the Slave. Since IDE (same as ATA) is phasing out, many motherboards only have 1 IDE connection so you may not have a choice.
In any event, this has nothing to do with bad sectors. I think I will just get a drive and enclosure which I can plug into an eSATA port of my computer, and transfer/copy the data over and then backup periodically, using Karen's Replicator or something similar.I have a Corsair HX520W, which has been running since September 2007. See my post Thermaltake power supplyWhen you say that C: E: F: are on the same cable, does that mean H: is on another cable. Maybe a dumb question, but hardware and how things are connected inside the case are a mystery to me, and that is why I had my system custom built, and hopefully to last for at least 5 years before upgrading to a new system. Click to expand.I had a pre-assembled pc before with a Hitachi sata hdd that was diagnosed with bad sectors by checkdisk. I used Hitachi's diagnostic software (Hitachi Drive Fitness test) and said there was nothing wrong with the drive.
Third party diagnostics all said it had bad sectors (HDDTune, Spinrite, even Seatools of Seagate!).In Seatools i have also experienced other third party diagnostics telling me that the drive failed but yeah it passed Seatools. Don't trust your manufacturer's diagnostic. Use them but do second opinion checks.But bear in mind, it has defects and it will eventually die so change it or RMA it.
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