Teac FD-55 Series - Instructions for Handling

2-1. INSTRUCTIONS FOR HANDLING
The TEAC FD-55(L) series mini flexible disk drive (hereinafter referred
to as FDD) does not require specially delicate handling as long as it is
handled according to the following instructions.
The same care as other similar mini flexible disk drives is required.
Read through and referred to this Instruction Manual before your operation
or system design so that the FDD can show the expected performance.
2-1-1. Disk
Two types are commercially available for 5.25 inch (mini) flexible disks
(hereinafter referred to as disk) according to the sectoring of a track.
One is hard sectored method, which detects each sector photo-electrically
by means of sector holes. The other is soft sectored method which
records an identification pattern on the initial position of each sector.
The FD-55 may be used with either type of disks. Generally, hard sectored
disk is used only for some specific applications.
Fig.20l shows the external view of the disks. The only difference is
that the hard sectored disk has the same number of sector holes as the
number of sectors, on a concentric circle together with an index hole.
The disk itself on which data are recorded is made of 80~ thick
polyethylene film with coated magnetic surfaces. The disk is protected
in a vinyl chloride jacket with liner to retain dust without damage to
-the disk surface. The jacket has open areaSi disk positioning and disk
driving window (central window), oval window for magnetic head contact
with the disk (head window), and index/sector hole detection window
(index window).
In order to maintain high data reliability, it is recommended to use
high quality disks.
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