I got a new hdd hard drive 1TB ,..is there any way i can use it as a portable drive,and use to exchange and store data between multiple pc's(new as well as old.)..if yes what do i require?..is there any difference between hdd 's used by old and new computers..
Last things first. Yes, there is a difference in some cases. If the drive is old enough, it may have an EIDE interface (40-pin cable) and not the current SATA interface.
To use it as a portable drive, you must first pick USB 2.0 (compatible with almost every computer) or USB 3.0 (works at 2.0 speeds with a 2.0 machine; much faster with a machine that supports 3.0)
Then you must decide whether you want to spend more and put it into a nice safe enclosure, or spend less and use it as a bare drive. For now, I'm going to assume that it's a 3.5" drive.
Simple, cheap, fragile could be something like this cable that will attach a bare drive, SATA or EIDE, to a USB port. For example, http://www.newegg.com/Product/Product.aspx?Item=N82E16812232002&cm_re=usb_sata_adapter-_-12-232-002-_-Product
A little more work, a little better looking, a little more rugged: Buy an empty enclosure and install the drive in it. But you might as well have bought an external USB drive anyway: For example, http://www.newegg.com/Product/Product.aspx?Item=N82E16817707153&cm_re=usb_enclosure_3.5_sata-_-17-707-153-_-Product
And there are enclosures that will allow a full-speed ESata connection, if your newer machines have ESata ports. For example, http://www.newegg.com/Product/Product.aspx?Item=N82E16817182179&cm_re=esata_enclosure_3.5-_-17-182-179-_-Product