Vista - Looking for an encryption software

I am looking for an encryption tool to encrypt the exnternal harddrive and
network drive. Here is what I want.

When I copy the files to the external harddrive, the files are encrypted on
the fly. The applications on my machine can read/write to the drive
seamlessly. They don't even aware that the drive is encrypted.

I don't have to enter the passcode to set up the encrypted drive when the
machine reboots.

When I or someone take the drive and put in another computer, he has to
enter the passcode to see the contents of the encrypted drive.

I found a free software called TrueCrypt. It almost does what I want to do.
But I have to "mount" the drive everytime system boots up. That involves
entering the passcode. Is there any software does what it does without
renetering the passcode and remounting the drive?

It looks like Vista Bitlocker can do what I want to do. But I am using Vista
Home Premium.

Thanks for your help.

"Pete" <nospam@xxxxxx> wrote in message
news:e4C$Kt4kIHA.1208@xxxxxx....So, if I understand correctly, you have data that is very much worth
protecting, but not worth very much?

Vista Bitlocker can do what you want to do for the local disk, but not the
network drive. EFS can encrypt your files and folders on both local and
remote drives, but transmits the files in clear-text if you aren't using
something like IPsec.

As pointed out, Vista won't do Bitlocker (or EFS) from certain SKUs, so you
may find that you have to upgrade Vista in order to protect your data.

How much is your data worth protecting?

Alun.
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I also recommend Vista BitLocker as a good encryption tool. Vista Ultimate has it all. Including a full backup of the PC in case of drive failure.