Chapter 1 General Information; Descri Ption - NEC FD1165 Maintenance Manual

CHAPTER 1
GENERAL INFORMATION
This chapter gives an overall description of the Model
FDl165 8-Inch Flexible Disk Drive, describes the features
and parts of the disk drive in detail, and lists the speci-
fications.
1.1 DESCRI PTION
The Model FDl165 Flexible Disk Drive is a compact magnetic
disk storage device that uses single- or dual-sided, single-
or double-density flexible disks. The storage capacity of
the disk drive depends on the type and format of the disk-
ette that is used. wi th a dual-sided flexible disk and a
double-density format, the maximum-storage capacity is 1.6
million bytes (MB).
The most apparent features of the Model FDl165 are its small
size and light weight. The disk drive measures 8.55 inches
(2l7.2 rom) high, by 2.28 inches (58.0 rom) wide by 13.20
inches (335.0 rom) deep and weighs only 7.7 pounds (3.5 kg).
The disk drive has all the features and performance of
larger, conventional units, and is media-compatible and
interface-compatible with ~hem. Because the Model FDl165
measures one-half the height of 'conventional disk drives,
two disk dr i ves can be mounted in the same space as one
conventional drive.
The Model FDl165 is operated by an external controller (NEC
~PD765
is recommended) through a Transistor Transistor Logic
(TTL) interface. The disk drive requires an external power
supply that must supply and control two vol tages, +5 Vdc
(for the TTL) and +24 Vdc (for the dc direct drive spindle
motor) (see Section 1.2.3). The disk drive features a
microprocessor-controlled head loading mechanism that mini-
mizes head and media wear. The head position mechanism
(stepping motor) is also microprocessor-controlled to ensure
extremely accurate head positioning.
1-1