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The modern personal computer hard drive has many internal parts.[[File:hard_drive_internal.png]]In order to increase the amount of information the drive can store, most hard disks have multiple platters. The drive in the illustration has three platters and six read/write heads. Both the top and bottom of each platter surface is used for data storage. The mechanism that moves the arms on a hard disk is constructed using a high-speed linear brushless type motor.When a hard drive starts to fail, there are often warning signs. It is important to notice these warning signs and get all of the important current data you can off of the drive before it becomes unusable. The most common warning sign is sound. If your hard drive seems much louder than usual or makes clicking or grinding sounds, check it ASAP and be prepared to backup your data and replace the drive. If it seems much louder than usual or makes occasional clicks or grinding sounds, check it ASAP and be prepared to backup your data and replace the drive.