Running encryption on external hard disk causes a extra drive

I brought Sony HD-SL1/SL2 1TB external hard disk.

I downloaded software to encrypt the hard drive from sony website. Once i downloaded and installed the encryption on the external hard disk two drives were created.

Drive D: Containing encryption software (around 1GB size)
Drive E: Where i can store files (around 1TB size)

Why does running encryption result in 2 drives?
EncryptedDrive.png
gram77Asked:
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Russ SuterCommented:
The device itself is recognized by Windows so it is mounted on the next available drive letter. Then the decrypted volume also needs to be accessed so it gets its own drive letter also. This is entirely normal behavior for 3rd party volume encryption tools on Windows.

You should be able to go to the Disk Management section of the Management console and unassign the drive letter from the encrypted volume. Most volume encryption tools will still recognize the device and you can mount the encrypted volume without the annoying 2nd drive letter.
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gram77Author Commented:
But why can't the software show a single encrypted drive. Why 2 drives?
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Russ SuterCommented:
The first drive letter is assigned by Windows as soon as the volume is recognized. Even though Windows can't read the volume it still assigns the drive letter. The volume encryption software then has to mount the decrypted data somewhere and it's limited by what the operating system can accommodate which is why you get a second drive letter.

As I mentioned earlier, you can remove the drive letter from the encrypted volume using the Disk Manager but it doesn't always work when the volume is remounted. Windows is kinda funny that way.
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