IDE 0 always has the designation C. Its a throwback to the days when computers were single or dual floppy drive only and they had (and still have) designations A and B. Hook up the external drive, go into the BIOS and select the external as the drive to boot from. Save the change and allow the computer to boot. Load the OS and it should defer to the external drive.
Another five-letter word for 'change' is 'alter.'
I presume you are asking if you can use an external drive on different computers? The simple answer is yes but you can't install programs on the external drive to run on other computers (except the one it was installed on), this is because programs spread themselves in different parts of the computer, so bits of the programs would be missing if you tried to run it on another computer. Other than this the only problem is viruses which can be transmitted through infected files if you aren't careful where you plug in. NOTE the external drive "could /will" change its drive letter depending how many drives are on the host computer this isn't a problem! just be ready to look for your files in a different labelled drive in "My Computer" (presuming you are using a windows computer)
If you are using Win2000 or XP you can use the Computer Management Tool (Start>Control Panel>Administrative Tools>Computer Management) and select Disk Management. The drive name can then be changed by right clicking on the drive you want to change and selecting "change drive letter..." This procedure only works in the OS is not booted from the external drive.
The volume label of an external hard drive refers to the string, which shows before the drive letter if you were to look at the drive using My Computer. For instance, if it is written External Drive:E, then the label is External Drive.
swap
It installs to C:\ because that is the drive you told it to install to. If you want to install it to another drive, simply choose a different drive letter during installation. Note that if you choose an external drive, the game will likely not work on another computer if you move the disk.
User
change 'e' and you get noon
Morph
site sireside
External traits that start with the letter d:dapperdebonairdirtydrunk
It may be because the letter 'I' is very easy to change on your ticket to be another letter.