Can I use my Seagate hard drive as an external hard drive?

"Yes, that should work.

Hard drives come in two main sizes, 2.5"" and 3.5"". In general, desktops use 3.5"" drives (which can have increased capacity, due to their increased physical size) and laptops use 2.5"" drives (to reduce the size of the computer). When purchasing an enclosure, you should make sure to get one that fits the right size - if in doubt, choose one that fits both sizes.

It is highly likely your hard drive is formatted with HFS+, which will work just fine on any newer Mac without any additional effort."

"Yes for sure you can use it. But first you need to check whether its SATA or IDE.

In any case you need to get a 2.5'' cady case to fit your hard drive in. You can order this case online for few buks. Once you get this box then attach your hard drive inside via connector cable or slot inside and then carefully close it putting the screws back. Once done then you can use the USB cable to attached the enclosed hard drive with your PC."

Here try this http://www.pcadvisor.co.uk/how-to/storag...