Why doesnt my external harddrive show up in my computer?

Michal has a good idea. A Linux may be able to read the stuff. Then you can transfer the data (if any) to another device. You could use this - all you need is a 4GB USB stick and some place to move the data to.

http://www.sevenforums.com/tutorials/287439-emergency-kit-save-your-files-dead-os.html

Don't get confused by the title. It would work for you. But any live Linux CD like the suggested Puppy would work too. Only thing is that Puppy is a bit awkward to copy files. Mint which is on my suggested stick is easier to operate. Plus you get a nice OS that can be used anywhere.
 

My Computer My Computer

At a glance

Vista, Windows7, Mint Mate, Zorin, Windows 8from 1.6GHz Duo to i7
Computer Manufacturer/Model Number
HP, Dell, Gateway, Toshiba - 4 laptops and 2 desktops
OS
Vista, Windows7, Mint Mate, Zorin, Windows 8
CPU
from 1.6GHz Duo to i7
Monitor(s) Displays
2x HP w2207
Hard Drives
5x HDD, 7x SSD, 12x Externals
Keyboard
with trackball - no mices
Mouse
Trackball mice
Internet Speed
DSL 6000
Well there is no important data on it and I cant get it working like you said I might aswell get a sata drive..
 

My Computer My Computer

At a glance

Windows 7 Ultimate x64AMD A10-4600M APU8GBAMD Radeon HD 7660G
Computer type
Laptop
Computer Manufacturer/Model Number
Toshiba
OS
Windows 7 Ultimate x64
CPU
AMD A10-4600M APU
Motherboard
TOSHIBA Portable PC
Memory
8GB
Graphics Card(s)
AMD Radeon HD 7660G
Hard Drives
699GB Hitachi HTS547575A9E384
Antivirus
Microsoft Security Esssentials
Browser
Google Chrome
So it's back to the museum, :D
 

My Computer My Computer

At a glance

Vista, Windows7, Mint Mate, Zorin, Windows 8from 1.6GHz Duo to i7
Computer Manufacturer/Model Number
HP, Dell, Gateway, Toshiba - 4 laptops and 2 desktops
OS
Vista, Windows7, Mint Mate, Zorin, Windows 8
CPU
from 1.6GHz Duo to i7
Monitor(s) Displays
2x HP w2207
Hard Drives
5x HDD, 7x SSD, 12x Externals
Keyboard
with trackball - no mices
Mouse
Trackball mice
Internet Speed
DSL 6000
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