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Data recovery and forensic investigators have shown that you can read the sector locations in the bad block list, clear the bad block list, then access the original sectors and can recover data (albeit usually corrupted). After a certain number of retries set by the manufacturer, the drive will mark the sector as bad, and any future data will be stored in the reallocated sector block.Īnd as I mentioned before the standard reallocation procedure does not 0 out the sector if it's reallocated. As long as ECC is enabled, whenever the drive attempts to read a sector, it will check the data against the ECC, and if there's a conflict, attempt to read it again. Now we're disagreeing with how secure erase affects the bad block list, so let's ignore that for a second. Before you mentioned that you ran a secure erase, then a surface check test, then checked the SMART logs.
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Now, there's a bit of a conflict with what you said here. This genuinely conflicts with what I understand and am trying to understand if I'm misinformed. Like I said, I've been doing this for years and years, and you can check the reallocated sector amount before and after running secure erase to verify this.īefore I continue I just want to say one thing: I'm not disagreeing with you to be a smartass or a know it all.
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It actually does, and the reason why it's faster is because it doesn't shuffle any data back to the system - the whole operation is done purely by the drive's own controller and firmware. The drive places the head at the very beginning of the platter, and then just starts writing 0's.ĮDIT: Likely it's the Surface Test that's what actually marks the the blocks as bad. This is actually why Secure Erase is so much faster than simply formatting the drive. Secure erase does nothing with the bad block list. The entire purpose of Secure Erase was to ensure that EVERY single sector on the drive is 0'd out, even if it's been relocated to the bad block list. So whenever you'd try to erase all the blocks, the original block would stay unchanged, and the reallocated sector would be the one that's cleared. When a sector is added to the bad block list, the original block is not 0'd out. Secure erase won't mark the sector as bad. (I often do this process to recover older disks) If you do decide to do this, I'd also recommend running SMART surface-area selftest afterwards and checking the SMART log, whether the test completed succesfully or not - if it did, then secure erase managed to successfully reallocate those sectors. booting Linux from a USB-stick and performing it there with hdparm is probably the easiest way.
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There are multiple utilities for that, but e.g. If you don't wish to go that route, an way of forcing the disk's firmware to mark the sector bad and allocate another one from the spare-area is to perform ATA Secure Erase on it. If it's a brand new drive with bad sectors, I'd RMA it immediately. Please note that if there are any bad sectors found during check disk, there could be data doss.CRC-error means that there are bad sectors on the disk. For best results, don't use your computer for any other tasks while it is checking for To check for both file errors and physical errors, select both Automatically fix file system errors and Scan for and attempt recovery of bad sectors.ĭepending on the size of your drive, this might take several minutes. This scan attempts to find and repair physical errors on the drive itself, To perform a thorough check, select Scan for and attempt recovery of bad sectors. To automatically repair problems with files and folders that the scan detects, select Automatically fix file system errors.
#HARD DISK DATA ERROR CYCLIC REDUNDANCY CHECK PASSWORD#
If you're prompted for an administrator password or confirmation, type the password or provide confirmation. Click the Tools tab, and then, under Error-checking, click Check now. Right-click the drive that you want to check, and then click Properties.ģ. Open Computer by clicking the Start button, and then clicking Computer.Ģ. Issues, or you can check an external hard drive if it's not working properly.ġ. For example, you can check your computer's primary hard disk to fix some performance You can solve some computer problems by checking a drive or drives for errors. You may check the drive for any errors and bad sectors, if any, and check if that fixes the issue. This is usually caused by hard drive hardware problems. The error data error (cyclic redundancy check) - This message indicates that the operating system has found a drive with bad sectors or some other intermittent