I have a IDE hard disk , I want to know is there any cable available which I can use to connect my hard disk to USB and can have external hard disk facilities?
Yes there is... You're looking for an internal to external IDE to USB. I used one a while back to copy all my data off of my failed computer.
I would suggest an External IDE HD enclosure.
EDIT: You beat me to it Matt.

Can you tell me from where I will get this cable from? Is there any place where I can buy?
(12-21-2009 11:24 PM)RWenger Wrote: [ -> ]I would suggest an External IDE HD enclosure.
EDIT: You beat me to it Matt. 
It's not just a cable. It's an enclosure as Robert said. Hard-drive needs data cable and power cable. Usually there will be a fan built into the enclosure to keep the drive cool.
I have a few of
these in my shop for hard drive backups & repairs.
I have IDE 2.5 -> USB, IDE 3.5 -> USB, & SATA -> USB
I also have an older AT Power Supply to power the 3.5 & SATA drives.
Its little costly there I have got it from ebay for 10 USD with free shipping for the same product, thansk for the support
(12-22-2009 03:14 AM)no2pencil Wrote: [ -> ]I have a few of these in my shop for hard drive backups & repairs.
I have IDE 2.5 -> USB, IDE 3.5 -> USB, & SATA -> USB
I also have an older AT Power Supply to power the 3.5 & SATA drives.
eBay is cheaper for a reason

Newegg has good prices.

Can you shoot a link to the product from newegg?
I've purchased from them in the past, never had any bad issues.