Yes
If a hard drive is external to computer then it is easy to move it between computers if required or take it away for safe keeping. If it has a good had drive enclosure then it is more protected from the elements or from accidental damage.
It depends on what failed. If the enclosure failed, then you can probably just hook the HD up internally or to another enclosure. If the HD failed, then it's unlikely that you can salvage the information without professional intervention.
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
You can purchase an online hard disk enclosure from the shopping website known as newegg. Alternatively you may find a better price on the amazon shopping website or from the ebay bidding website
The easiest way to make an internal hard drive portable is to purchase what's called a hard drive enclosure. Hard drive enclosures are kits that have everything you need to make your own portable hard drive. Make sure you get a hard drive enclosure that matches the size and interface type as your hard drive, as well as the means of connectivity that you wish. As an example, you can have a 3.5" IDE hard drive enclosure that connects to your computer with a USB cable. Most computer stores have hard drive enclosure. The best place to get one is probably tigerdirect.com. There are many of them available on eBay.
I'm going to assume you want to use the old drive as a secondary drive for this answer. Get an external USB hard drive enclosure which is compatible with your "old" drive. CHECK ON THIS, there are several types of hard drive (SCSI, IDE, EIDE, and SATA) and you need to be sure the enclosure and drive are compatible. (Cost: around $30-$40)Put old hard drive in new external case, plug in power source, plug USB into laptop. Plug 'n' play (uPnP) will recognise drive and incorporate it into devices.
6.50" x 6.14" x 0.84"
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.
External Hard Drives are generally connected to USB ports or FireWire ports.
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.
A hard drive enclosure plugs into a computer to provide external storage. Its main purpose is to provide extra storage on a laptop or computer and to transfer files between computers. An external drive is also useful for backing up data on a computer.
There may be several causes: The AC power connector (if it uses a "wall wart" instead of having power internally), overheating, or the circuitry in the enclosure itself is going bad (which can happen in a few years depending on the brand). It would be easier to help you if I knew exactly what type of enclosure is giving you this problem.The best thing (but may not be the easiest if you're not familiar with taking computers apart) is to remove the drive from the enclosure and see if your computer can access the drive without the enclosure. If it can, then either put the drive in your computer or buy a hard drive enclosure (with a fan) and put your drive in it.--The Chief Geek