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Now if you remove your drive and re-insert it, OSX will ask for a password.
To remove the encryption simply right click on the drive and select Decrypt.
2.BitLocker (free)
BitLocker is Windows' built in hard drive encryption software. It works on Windows Vista, 7, and 8. This guide will be using Windows 8 but the directions are mostly the same on all 3 operating systems.
Insert your drive, find it either in your sidebar in Windows Explorer, or in your Computer menu and right click it. From there, select Turn on BitLocker.
You will be greeted by the BitLocker screen.
You can now select options to encrypt your drive. We will be using password protection today.
Note: Your password MUST include an Uppercase letter, a Lowercase letter, and a number to be compatible.
Click next when you're ready to continue.
BitLocker also requires you to backup a recovery key which can be used to recover the data from your flash drive if it ever happens that you forget your password. You must perform this step in order to continue.
These two options allow you to either format the drive and encrypt it quickly, or perform a slower encryption which will attempt to retain any data contained in the drive.
You are given a small summary page before you are asked to continue, if any of these options are not to your liking simply press Cancel and start the process again.
The speed of the encryption depends on the size of the drive and which encryption option you chose. My 8GB drive took about 2 minutes to encrypt.
Now if you remove and insert the hard drive you will be asked to enter a password, or you can enter a recovery key and have Windows automatically unlock the drive every time you insert it into the PC.
When you unlock the drive, it should look like this in your Computer.
To remove the encryption simply right click on the unlocked drive and select Manage BitLocker from where you have several options, one of which is Remove password from this drive.
3.Alternative Encrypting Applications.