As direct drive technology is finding their way into telescope drive designs for its many advantages, it would push to
more reliable and cheaper solutions for future telescope complex motion system. However, the telescope drive system
based on the direct drive technology is one high integrated electromechanical system, which one complex
electromechanical design method is adopted to improve the efficiency, reliability and quality of the system during the
design and manufacture circle. The telescope is one ultra-exact, ultra-speed, high precision and huge inertial instrument,
which the direct torque motor adopted by the telescope drive system is different from traditional motor. This paper
explores the design process and some simulation results are discussed.
KEYWORDS: Optical discs, Data storage, Reliability, Manufacturing, Digital video discs, Digital recording, Phase only filters, Humidity, Data archive systems, Climatology
"Quality requirements and handling regulation of archival optical disc for electronic records filing" is released by The
State Archives Administration of the People's Republic of China (SAAC) on its network in March 2007. This document
established a complete operative managing process for optical disc data storage in archives departments. The quality
requirements of the optical disc used in archives departments are stipulated. Quality check of the recorded disc before
filing is considered to be necessary and the threshold of the parameter of the qualified filing disc is set down. The
handling regulations for the staffs in the archives departments are described. Recommended environment conditions of
the disc preservation, recording, accessing and testing are presented. The block error rate of the disc is selected as main
monitoring parameter of the lifetime of the filing disc and three classes pre-alarm lines are created for marking of
different quality check intervals. The strategy of monitoring the variation of the error rate curve of the filing discs and
moving the data to a new disc or a new media when the error rate of the disc reaches the third class pre-alarm line will
effectively guarantee the data migration before permanent loss. Only when every step of the procedure is strictly
implemented, it is believed that long-term reliability of the data storage on optical disc for archives departments can be
effectively ensured.
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