Step 2: Drive Mounting

The next step is to mount the drives in the system.

This includes Hard Disk Drives, Floppy Disk Drives, CD-ROM's, CDRW's, DVD's and other devices that require a drive bay for installation. 
The reason we suggest this next is that, in some instances, the peripheral cards installed in the computer can block one, or more, of the mounting points of a drive.
Keep in mind which drive(s) will be attached to which connection (primary or secondary) - and which drives are going to be setup as master and slave, so you can set the jumpers BEFORE screwing them into the case (where you might not be able to get to the jumpers). If you are using SCSI drives, the drive ID's MUST be set.
When installing a drive it is imperative that at least four (4) screws be used to secure a drive. Try to keep the drives on the same level, don't intermix the top screw holes on one side and the bottom holes on the other side. This can cause the drive to become slightly "bound" or warped, and may cause read/write problems. You want the drive as level as possible. Keep in mind that most drives spin at 4 to 7,000 rpm (or greater).
It is also very important to use the correct size screw for the mounting. 
Typically there are two (2) different types of screws that are used in computer assembly. The difference is easily visible to the naked eye. One screw has a narrower diameter and higher thread count than the other.
If you encounter too much, or too little, resistance when inserting a screw it is probably the incorrect size or threaded wrong. Be careful to not strip the screw or break it off. You will only need to make it snug to function properly.
After the drivers are secured in the case connect the power and data cables to the appropriate connectors. 

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