SOURCE: External Drive not visible
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Hello
Okay , so there are some steps to figure out what is wrong with your external.
Firstly , if your computer makes a sound when you plug in your external , go to Start-Control Panel-Administrative Tools-Computer Management-Disk Management , and see if your external drive is listed here with your local drives. If it is listed , right click on the drive and change the drive letter to make it appear in "my computer".
If your drive does not make a connection sound when connecting to your computer and also does not show up , please follow the next step.
Remove the hard drive from the casing if possible and install it in your computer case or another external case.If the drive works , the problem is with the casing and you can ignore the drive.
Now , if the problem is with the casing , there are still 3 possibilities.
The latter is the easiest to diagnose , does your external light up at all when you plug in the power? If not , then this is probably your problem. On the bottom of the adapter is a label which you will be able to use to have a new adapter made at your local electronics shop and this will cost about $30 max. They will also be able to test the adapter with a clamp meter to see if this is really the problem and this should be free.
The second component you want to test is the USB cable. If you have a printer , swop out the cables and see if your printer functions normally. Most externals use the same connector so you should be able to test it in this manner. If the cable works go on to the last step. If the cable is defective , replace it with a new one which you can find for about $10 at most electronics and chain stores.
The last component to test is the circuit board. This is a bit of a grey zone as you probably won't be able to spot the blown component unless it failed really badly. With the casing already opened , locate the external's circuit board and check to see if you have any blackened components or fluids leaking from some components. If all the other components of the external worked perfectly , then this is the faulty part. It is not really economical to replace the circuit as most of the time it is out of production by the time you need to replace it and it still costs a lot even if it is available so if your drive is working perfectly when connected via sata or IDE on your computer , the best is to buy a new casing and place your old drive in the new casing.
A casing costs about $50 and you could get it at most tech shops and big chain stores like Best Buy.
I hope this solves your problem and please reply if you need more help.
Kind Regards
Andrea
SOURCE: Hi, I have brought seagate
Try going into the Device Manager and look under USB Controllers. It may be disabled there and just needs to be enabled again.
SOURCE: I cannot see my 'Seagate Expansion 640 GB USB 2.0
Hello, if the drive is new it may just need to be formatted, if it's an existing drive it may have a failed partition.
If it's new, connect it to the computer, right-click on your My Computer or Computer icon and left-click manage. When the management console opens left-click Disk Management, then scroll through the right panel and find your 640GB drive. As long as it's there and unallocated you can right click on the unallocated space and select format. Follow the wizard using the default settings. When you're finished it should show up in My Computer.
If this is an existing drive and has failed, proceed to the management console and see if it shows up, if it does make note of all information show in the right panel and either way report back for further assistance by reply to this response.
Hope this helps FixYa,
Chris
SOURCE: I do not know how
Just plug it into your computer, it should install a driver and then you can go to 'My Computer' and click on the drive, it should be an F drive but it could be anything. An easy way to know which drive is the portable one is to go to 'My Computer' before you plug the other drive in, then you know which one is new.
Check the Windows Device ManagerDevice
Manager is a Windows program that displays hardware devices installed
on your computer that are currently recognized by Windows. If
functioning properly, each piece of hardware has a corresponding entry
in the Device Manager. If a piece of hardware is not listed, then there
is a problem. There can be a variety of reasons, ranging from the
easy-to-fix (such as missing or corrupted device drivers) to the more
serious (such as broken or malfunctioning hardware).If
your drive does not appear in Windows Explorer or there is no response
from the operating system when you insert a disc, then you should check
for an entry in Device Manager. This indicates whether there is a
problem or not, and sets the stage for subsequent troubleshooting
actions.To verify that the optical drive is listed in the Device Manager:
(in Vista) or the arrow 
(in Windows 7) next to the type of driver you want to uninstall and
reinstall (for example., Modems, DVD/CD-ROMs, and so on), unless a minus
sign (-) is already showing.67 views
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