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| April 21, 1998 |
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SALES OF 5.25" SIZED MO DISKS
(WITH 8 TIMES CAPACITY) |
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| Mitsubishi Chemical Corporation |
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In early May of the year, Mitsubishi Chemical Corp. (Tokyo, Japan, President:
Akira Miura) is to release 5.25" (130 mm) magneto-optical disks with 8 times capacity
in 3 items (4.1 GB, 4.8 GB and 5.2 GB) for sales, which are in compliance with
the relevant ISO standard (a world standard).
In recent years, network building has been rapidly expanding among private firms
and governments, while opportunities to handle large sized files, such as picture
files, have been increasing, so that data have been growing tremendously, and
the required periods of time for data storage have been remarkably extended. As
a result, there have been growing demands for larger capacity disks, including
5.25" disks, for data back-up or replacement for network servers, etc.
 The 5.25"
MO disks with 8 times capacity to be released for sales this time are realized
with higher density recording by ingenious means, including the reduction of the
track pitch from the former 1.15µm (for 4 times capacity) to 0.85µm,
etc.
Mitsubishi Chemical Corp., the top ranking manufacturer of MO disks in the world,
shall be further engaged in the development of new products to meet the future
market requirements, and shall endeavor for the propagation and promotion of MO
disks.
FEATURES OF THE NEW PRODUCTS
| 1. |
1. Higher Density Recording:
The shortest recording mark has been shortened from the former 0.67µm (for
4 times capacity) to 0.53µm through the improvement of recording membrane,
the track pitch has been reduced from the former 1.15µm (for 4 times capacity)
to 0.85µm through the high precision mastering and molding technology, and
the recording zone in the peripheral section of the disk has been expanded, so
as to achieve the memory capacity of 8 times. Thanks to various know-hows accumulated
from the development of MO disks over many years, the expanded memory zone in
the peripheral section can retain good stable properties. |
| 2. |
Compliance to the relevant ISO standard (a world standard):
The newly introduced MO disks are in compliance with ISO/IECFCD 15286, a world
standard, and are made in consideration of past assets and future compatibility. |
| 3. |
Adaptability for rough treatments in the juke-box:
In order to prevent dusting by rubbing with the cartridge, the disk is attached
on both the surfaces with slips made of a high performance plastic. Also, a plastic
hub is adopted in order to suppress the deformation by repeated installation into
the drive and to minimize the increase of disk eccentricity. Furthermore, a material
with anti-static treatment is used for the cartridge to prevent possible noise
generation by static discharge from the static-charged cartridge of a juke-box
system which is expectable to be operated continuously. |
REMARKS
| 1. |
Product Name: |
Mitsubishi Chemical 5.25" (130mm) Sized MO Disk with 8 Times Capacity. |
| 2. |
Date of Sales Release: Early May, 1998 (provisional) |
| 3. |
Major Specification
| Product No. |
MH4G1U |
MH4G8U |
MH5G2U |
| Standard |
ISO/IEC FCD 15286 |
| Memory capacity (unformatted) |
4.1 GB |
4,8 GB |
5.2 GB |
| Bites/sector |
512 |
1024 |
2048 |
| Format system |
ZCAV/continuous servo |
| Recording system |
Mark edge recording |
| Track pitch |
0.85µm |
| Optical head wave length |
680 nm |
| Shortest mark length |
0.54µm |
0.58µm |
0.54µm |
| Substrate material |
Polycarbonate |
| Disk outer diameter |
180 mm |
| Cartridge dimension |
L158 x W135 x D11 mm |
| Environmental conditions |
During the usage |
During the storage |
| Temperature |
5 ~ 55 |
- 10 ~ 55 |
| Relative humidity |
3 ~ 85% |
3 ~ 90% |
| Temperature gradient |
Max 10/hour |
Max 15/hour |
| Abst. Humidity gradient |
Max 10%/hour |
| Absolute humidity |
1 ~ 30 g/cu. M. |
Note: The retail prices are on an open price system |
| For further information, please contact |
| Mitsubishi Chemical Corp., |
| Public Relation and Surveying Department |
| Tel: [81] 3-3283-6274 |
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