How to recover files from corrupted external hard drive?

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.

M3 Data Recovery Free is a free external drive data recovery software which can recover files from corrupted external hard drive, hard drive, pen drive, USB flash drive. It can also recover deleted files, recover data from formatted drive and recover lost partition.

Data recovery from corrupted external hard drive on Mac computer, please go to M3 Data Recovery for Mac.

Step-by-step tutorial to recover files from corrutped external hard drive

Step 1: Download and install M3 Data Recovery on your computer.

Step 2: Connect the corrupted external hard drive to your healthy computer as slave drive and then launch M3 Data Recovery.

Step 3: Choose "Data Recovery" module.

Recover files from corrupted external hard drive

Step 4: Select the corrupted external hard drive which you want to recover data from and click Next to scan the lost data from corrupted external hard drive.

Recover files from corrupted external hard drive

Step 5: Recover data from corrupted external hard drive.

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