Based on our investigation, the DLT library or DVD-R juke box systems would be our preferred choice among the mass storage devices. While the DVD-R technology is relatively new and still developing, the prospects and longevity of the DVD technology appear promising. As the price of media is going down, the price/GByte of the DVD juke box becomes comparable to the DLT library of the similar capacity. As of December 1999, a juke box that can store over 700 disks is available. This device can hold >3 TBytes of data with single-sided DVD-R disks.
For the minimum requirements at the summit,
additional hard disks to hold up to 
60 Gbytes
of the data temporarily and a mass storage system to
hold 1Tbytes are necessary with backup rate of
20 Gbytes/day. A single unit of the DVD-R juke box
would be sufficient for the storage system.
The data are copied to media and can be
delivered to the Cambridge and Nankang sites.
At these sites, each should have 2-4 Tera byte
juke boxes at initial installment.
These are based on on-line archive facility model discussed
in the previous sections. If the data are to open to
the wider astronomical community, separate storage systems
may need to be dedicated for data search and retrieval
for archival data researchers.
Investigation of the hardware on the market as well as the actual applications at other astronomical institutions should be continued. In particular, optical and X-ray astronomy fields have more experience in on-line database and mass storage system, and visits to such institutions would be very valuable.