[oldtoot]

Can I clone 3 laptops, 2 with 120 GB HDD's and one with a 150 GB HDD to an external USB HDD with 500 GB capacity or do I need a separate external HDD for each PC I want to clone? Thanks in advance.

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In theory, yes.
In practice, probably not.

Most cloning programs will only work on one drive at a time, for your situation they would have to be images of the drives as opposed to a direct clone, and USB hard drive support outside of Windows is very patchy, if not completely unstable.

Yes it can be done. Just probably not as as easy as it would appear.

[Neil Jones]

In theory, yes.
In practice, probably not.

Most cloning programs will only work on one drive at a time, for your situation they would have to be images of the drives as opposed to a direct clone, and USB hard drive support outside of Windows is very patchy, if not completely unstable.

Yes it can be done. Just probably not as as easy as it would appear.

[Kemasa]

Yes, it can be done, but what exactly are you trying to do? Create a backup or make a usable copy? There are tool under Linux that allow you to copy filesystems and/or the complete data.