FLOPPY DISK DRIVE OPERATION Several basic components are common to all floppy disk drives. If this hole is not present, the disk can only be formatted as a 720K disk. If it is present, the disk can be formatted in the 1.44M mode. When a high-density disk is loaded into a high-density drive, a sensor checks for the presence of this hole. Media Indicator Hole On the lower right corner of some 3.5-inch disks is another hole that designates the disk as a high-density disk. switch is positioned so you can see a hole through the case, the disk cannot be written on. When the slide Figure 10-6.The 3.5-inch floppy disk. Figure 10-6 illustrates the location of the write protect/write enable slide switch. Write Protect/Write Enable Slide Write protection for the disk is accomplished by means of a slide switch in the lower left corner of the disk. When the disk is not loaded in a drive, this shutter covers the hole and eliminates the need for a disk jacket to store the disk. This shutter is spring loaded and moves out of the way to expose the disk when the disk is loaded into a drive. The first difference is the metal shutter covering the media access hole. Media Access Hole and Shutter Examining the case of a 3.5-inch disk, youll notice several differences from the 5.25-inch disk. This allows for greater densities of data to be written on the disk. Disk Case The 3.5-inch floppy disks rigid plastic case stabilizes the disk as it spins. This compound is iron-oxide for standard and double- density disks and a cobalt ferric compound for high- density disks. The disk is a thin flexible polyester film base that is coated with a magnetic compound. The 3.5-inch and 5.25-inch disks are constructed of the same basic materials. THE 3.5-INCH FLOPPY DISK CONSTRUCTION Figure 10-6 shows a 3.5-inch disk.
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