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When he used his external drive in Mountain Lion system it didn’t ask for password when the drive was mounted but after upgrade it began to ask for password to decrypt the drive. He used Mountain Lion before but some time ago he upgraded his OS X to Mavericks. My father has an external usb drive with his own data on it.

I’ve faced a serious problem which I can’t solve for several weeks already. Once it’s finished decrypting, you should be able to access your data again using normal recovery methods (booting from another 10.6 or 10.7 boot drive, utility drive, etc.) If you turn off the encryption, the encrypted drive will decrypt. If you unlock the drive, you should then be able to use Disk Utility’s repair tools to hopefully fix the problem that’s preventing your Mac from booting.ħ. When prompted for a password, you can enter the password of any authorized account on the drive.Ħ. Under the File menu, select Unlock “Drive Name” or Turn Off Encryption…, based on what you want to do.ĥ. As long as you have 10.7’s Disk Utility, this should work.Ĥ. Note: You can also boot from a 10.7 installer drive, boot to Target Disk Mode and connect it via Firewire or Thunderbolt to another Mac, or use some other 10.7-booting drive. Boot your Mac and hold down ⌘-R (Command –R) to boot from the Mac’s Recovery HD partition. Update – June 11, 2013: As of Mac OS X 10.8.4, you will need to unlock the encrypted volume first, then you will be able to decrypt it.

In the event that you find yourself in this place, or you’re about to be, here’s how you can unlock or decrypt your FileVault 2-encrypted drive using Disk Utility and the password of an account that’s authorized to log in at the FileVault 2 pre-boot login screen. Bad things happen and sometimes those bad things cause your FileVault 2-encrypted Mac to be unbootable.