I have 400GB external hard drive and give the following message when plugged to the computer "Drive is not accessible. The file or directory is corrupted and unreadable." How to recover data from corrupted external hard drive? please help me, thanks.
Generally, a hard drive can be corrupted physically and logically. Physically corrupted hard drive often indicates the permanent data loss. If this hard drive is physically damaged, you'd better send it to a data recovery company and pay some money to get data back.
However, the logically corrupted hard drive often can be fixed by formatting. The internal data also can be recovered via data recovery program. If the hard drive is logically damaged, luckily, you can try a data recovery software to get back your data and then format this corrupted hard drive to see whether it can work as before.