I am in fact talking about a file which can't even be compressed and put into an archive! When trying to do this, the first half of the file is being processed correctly, at which point when reaching like 60% in the file the OS itself reports an error while accessing it, and WinRAR reports a "Read/Data error in the file (cyclic redundancy control)" which not only renders the file unusable (like a common CRC checksum error would), but actually renders it unaccessable too (except for deletion)! (As opposed to a more common CRC checksum corrupted file which would still be readable by the OS and could be compressed, or processed by applications). I also realise I may not have explained my problem correctly talking about a "CRC error", as I'm not talking about a file being merely corrupted here: it is not a usual CRC _checksum_ error that makes the file unusable. Incidentally I should have precised that I'm using this external 3.5'' HD with a laptop, as I don't have a desktop computer (at the moment anyway), no overclocking, no USB hub, and both computer and external HD are well ventilated to prevent overheating. I will indeed find the shortest possible USB cable to use with this enclosure, and will use the surface test on the blocks where the corrupted file is. Many thanks for your comprehensive answer! I take good notice of your comments and advices. Some of these tests are destructive so be careful about the stored data. These tests can diagnose the disk even if it is used in this enclosure which does not allow detection of further disk information. I also recommend to use the tests at Disk menu Surface Test. This would immediately show if there is a serious error with the drive or if the drive itself logged any data transfer / communication errors at the "Ultra ATA CRC error count" attribute. Overclocking, memory problem, overheat (not only the hard disk but also CPU/chipset/RAM overheat) are also common causes of data transfer errors.Īnyway, the best would be to disassemble and connect the drive directly to the motherboard or using in an other enclosure which allows disk monitoring by Hard Disk Sentinel. I suspect it is a 3.5" drive so it may not be affected, but many 2.5" USB drives are suffering from this problem (except if two USB slots are used with an Y USB cable). Insufficient power is also a common issue for data transfer (CRC) errors. I recommend to connect the drive directly to a rear USB connector with the shortest possible USB cable and avoid using the front USB and avoid and USB hubs/extenders when connecting this drive. These may be related to the data communication channel: the USB cable or connection in this case. I thank you for your time reading this, and am really looking forward to your answer.ĬRC errors and data transfer errors in most cases are not really hard disk issues. Or may cyclic redundancy errors appear on a HD without necessarily being the symptom of something way worse about the health of the HD? My only question about this is: does this means my 1 year old external HD is in serious danger and about to fail completely? I have had and used (quite a lot!) this HD for about 1 year now, and this morning I got my first "Cyclic Redundancy" error while attempting to compress (with WinRAR) a bunch of WAV files! One of the files (which was previously extracted without problem from a ZIP archive) is now corrupted and unusable due to making this cyclic redundancy error every time it is accessed. Unfortunately, one of my 1Tib HD is in a USB enclosure that according to HDS is not sending any SMART information, and worse thing is the enclosure is sealed shut so that I can't remove the HD and put it in new compatible enclosure in order to check it. I have been enjoying the high efficiency of HDSentinel for more than one year now, and feel much safer about my datas thanks to it!
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