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2.1
Handling Microdrives
Microdrives are used in GZ-MC100 and GZ-MC200. Although the appearance is different, a Microdrive is exactly the same as a hard
disc that is used in a PC. Therefore, unlike handling conventional tapes, caution must be paid in handling Microdrives.
The handling of Microdrives is explained in this section.
2.1.1 The structure of Microdrives
The detailed inside structure of Microdrives is not disclosed as it is treated as trade secrets. However, it is essential to have knowledge
of the structure of Microdrives in order to carry out service properly. Some information about Microdrives is given here.
A Microdrive is mainly consisted of the following parts.
• A magnetic recording disk that is coated with magnetic ma-
terial. (Disk)
• A reading/ writing head. (Head)
• A motor that turns the disk.
• A circuit board that is loaded with electrical circuit which con-
trols the motor, the head positioning, and input/ output of the
signal.
1 head type Microdrives use one side of the disk, and 2 head type
Microdrives use both sides of the disk with heads on each side
of the disk.The disk and the head do not contact and there is
certain space kept between them. The head reads the pre
recorded servo information to control the head itself. When the
head is not in access to the disk, it is kept in a shelter to avoid
damaging the disk with shocks from outside.
The difference between a 2GB Microdrive and a 4GB Microdrive
is only whether it has one head or two heads and there is no
difference in performance, as shown in the specification list. A
2.5 inch hard disk that is used in a note PC is shown as a
reference. As a 2.5 inch hard disk is bigger than a Microdrive, it
has more disks and heads resulting in more capacity. On the
contrary, it seems impossible to increase the disks for a
Microdrive because of size restriction. High capacity will be
achieved by improving the areal density and rotation speed of the
future products.
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
2GB
Model name
Microdrive 3K4-2
Model number
HMS360402D5CF00
Capacity
2 GB
Interface
CompactFlash Type
Form factor
1inch
System type
Consumer electronics Consumer electronics
Cache buffer
128 KB
Disks / Heads
Rotational speed (RPM)
3,600 (RPM)
Media transfer rate
97.9 Mb/sec max
Interface transfer rate
33 MB/sec max
Average seek (ms)
12 (ms)
Average latency (ms)
8.33 (ms)
Areal density
56.5 Gb/sq. inch
Typical idle acoustic (Bels)
Operating shock (G)
200 G (2ms)
Non-operating shock (G)
2000 G (1ms)
Operating ambient temperature ( )
0
Non-operating ambient temperature ( )
-40
Shock tolerance during non-operation is remarkably high. Micro-
drives are designed to tolerate shock during non-operation as
they are removed or carried out more often than other hard disks.
However, Microdrives are vulnerable to falls and shocks just like
other precision instruments.
Microdrives are made in conformity with the standard of Com-
pactFlash Type II. The thickness of the drive is less than 5.5mm,
thus failures can occur by folding or twisting the disks. The stan-
dard for torsional stress is 6kg approx. and for flexing stress is
4kg approx. Be sure to carry Microdrives in protection cases on
the service sites, and strongly recommend the customers to do
so, too.
Microdrive
hard disk
4GB
80GB
Microdrive 3K4-4
Travelstar 4K80-80
HMS360404D5CF00
HTS428080F9AT00
4 GB
80 GB
CompactFlash Type
ATA ATA-6
1inch
2.5inch
Laptop
128 KB
8 MB
1/1
1/2
2/4
3,600 (RPM)
4,200 (RPM)
97.9 Mb/sec max
351 Mb/sec max
33 MB/sec max
100 MB/sec max
12 (ms)
13 (ms)
8.33 (ms)
7.1 (ms)
56.5 Gb/sq. inch
68.5 Gb/sq. inch
2.4B
200 G (2ms)
250 (2ms)
2000 G (1ms)
800 (1ms)
70 ( )
0
70 ( )
5
70 ( )
-40
70 ( )
-40
(No.YF058)1-5
55 ( )
70 ( )
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