Page 140 - Electromechanical Devices and Components Illustrated Sourcebook

102 Electromechanical Devices & Components Illustrated Sourcebook

Disk Slot
Locking Lever
Write-Protect
Iron Oxide Coating Sensor
Clamp Hub
Hub Cam
Mylar Backing Floppy Disk

Frame
Head
Figure 5-71 Magnetic Recording Media
Head Pivot Stepper Motor
Controller
Rack

Interface
The magnetic recording media is typically a plastic backing
Connector
with magnetically permeable coating. Figure 5-71 shows a typical
Figure 5-73 Floppy Disk Drive
recording tape with a Mylar backing and iron oxide coating.
Figure 5-72 shows various types of magnetic recording media.
Disk drives are probably the most common use of mag-
netic recording media today. Both floppy drives and hard
drives use advanced forms of this technology. Pivot Moving Arm
Figure 5-73 shows the internals of a typical floppy drive.
The floppy disk is inserted into the disk slot and the locking
Stepper Drive
lever is rotated down. As the lever is rotated down, the clamp Disk
hub locks in the disk and activates the drive. The head rides Frame
on a transport mechanism which is driven by a stepper motor, Ribbon Cable
Hub
rack, and pinion. All of the control functions and the digital
interface are carried on the controller board. Connector Head
Figure 5-74 shows the internals of a typical hard drive. The
disk spins at very high speed in an effort to minimize data

Figure 5-74 Personal Computer Hard Drive

1/4" Audio Tape

Insert This Side Into Recorder Do Not Touch Tape VHS

Video Recording Cassette
1.2
Meg. 1.4
Meg.
MC
Mini Cassette

3.5" Floppy disk A
**** **** **** ****
5-1/4" Floppy Disk 60 Minutes
Bank Card
Audio Cassette Tape
Figure 5-72 Various Types of Magnetic Recording Media