Removable hard disk drive tray
The following info will help to have a better idea about removable hard disk drive tray.
An interesting compromise between internal and external hard disks is the removable hard disk drive tray. A tray is installed into a standard PC case drive bay that allows regular internal hard disks to be placed into it. You then can swap the internal hard disk with another one without opening up the case, allowing you to use hard disks as a removable storage medium. In a way, the concept is similar to the way a removable car stereo is designed. These trays are also commonly called mobile racks, drive caddies and several other names.
For certain applications, this are the ideal removable storage device: it uses regular hard disks, which are very fast, highly reliable, very high capacity and very inexpensive in terms of dollars per byte of storage. They can be used for backup purposes (secondary to a regularly-installed standard internal hard disk)。Removable trays can also be used to allow the use of different operating systems on the same PC (though there are simpler ways to do this) and to allow different people to use the same PC while keeping their data and programs totally separate.
If you decide to use a mobile rack system, be sure to check out the specifications of the unit you are considering carefully. Different models come with support for different speed drives, some are made primarily of metal and others of plastic, and so on. Metal units will provide better cooling than plastic ones. Some also come with an integrated cooling fan, which is a good idea especially for higher-RPM drives.
Note: If you decide to set up this sort of arrangement with your PC, remember that regular internal hard drives are designed under the assumption that they will be installed inside the PC and left there. Be sure to handle them properly, and especially, to observe ESD precautions.
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