SeaTools goes to each one in the list and if it really is bad the program will try to reallocate that one sector. “Fix All Fast” uses the drive's activity logs to identify suspicious sectors which may or may not be bad. Unless the drive is full of data, it is quite possible for the problem sector to be empty of data, anyway. When SeaTools reallocates these problem sectors the actual data in a particular sector is unreadable and already lost. Be sure that you have all of your data backed up before running any of the “Fix All” tests. There are two options with the “Fix All” tests, “Fast” and “Long”. The “Fix All” tests provide the ability to fix problem LBA’s (bad sectors). The apparent lack of activity often gives the impression that the drive or software has stopped responding. Because the long tests read every sector on the drive, the amount of time required will depend on the speed and capacity of the disk drive. The long tests will take time to complete. If you need a more comprehensive test then consider running the “Long Generic”, which reads each sector on the drive. The "Short Drive Self Test" is adequate for most situations. The “Short Generic” test is similar and tests various areas of the drive. When you launch the "Short Drive Self Test" (DST) most drives will run a thorough diagnostic routine that is built into the hard drive's firmware.
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