it is a sub stance
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Unfortunately, there are no travel cases for hard drives. However, a simple external enclosure will do the trick very well.
A portable hard drive is just an external hard drive with set memory, for example 320GB, A hard drive enclosure is if you have an internal you wish to use as an external, you simply connect it to the enclosure and use it. However permissions etc have to be overwritten to access the data, so if your not very technical, best just buy an external
Yes they are, although you can get external hard drives that are separate.
External Hard Drives are generally connected to USB ports or FireWire ports.
no you cant. the drive bays in a tower are to big.
Most external hard drives can be used as internal ones. Provided that the IDE, SATA, or SCSI interface of the external hard drive is the same as the desktop's system board hard drive interface. Users can remove the USB casing and proceed to plug the data and power cables into it. The external drive, just has an additional component, that's used to hook up with the USB port.
An External HD is a hard drive that is in a separate enclosure other than your PC that connects via a wire. Most commonly USB, ESATA or firewire.
The WD Elements has several highly rated external hard drives to choose from, another highly rated brand is the My Passport line of external hard drives.
Western Digital and SeaGate are the top manufacturers of hard drives, internal and external.
Simpletech produce portable external hard drives. These range from small USB sticks, to larger external hard drives. Simpletech also produces mini versions of the portable hard drives
There are many portable external hard drives which would fit into most standard size pockets.