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These are great little units that you can use to have your hard drives in and remove them from your PC without having to unscrew everything to open it up. The little draws just side in and out with your hard drive inside. I don't know why more people don't use them. For security, you can take out the hard drive and keep it somewhere safe, or use it in a different PC. Its useful to be able to put new operating system on your PC, without having to 'dual boot.' I have got the new Windows 7 on one and Ubuntu 9.04 the J.J. on another. To boot up and be on the internet, Windows 7 takes 2 mins 20 seconds, Ubuntu takes 1 min 15 seconds. Check when in use that the hard drive is well ventilated and doesn't get too hot, or you may need an extra fan. Also, if you are going to be changing the hard drive inside the caddy often, it may be worth having more than one, as after repeated use the 40 way IDE cable can eventually fail.
StarTech's DRW110ATA is a removable hard drive drawer featuring unique shock absorbers that offers a cost-effective way to quickly insert or remove ATA hard drives from any PC with an available 5.25-inch drive bay, without opening the computer. It is an ideal solution for high-speed back-ups of critical files, moving large files from one computer to another, and for running multiple operating systems on the same PC.
While providing security and minimizing downtime, the DRW110ATA features unique shock absorbers that help limit physical damages to the enclosed hard drive during transport. The absorbers take the bumps and jumps associated with moving the DRW110ATA from place to place and channel them away from the drive.