In this paper, we present the architecture and implementation of a virtual network computers' (VNC) optical storage
virtualization scheme called VOSV. Its task is to manage the mapping of virtual optical storage to physical optical
storage, a technique known as optical storage virtualization. The design of VOSV aims at the optical storage resources of
different clients and servers that have high read-sharing patterns. VOSV uses several schemes such as a two-level Cache
mechanism, a VNC server embedded module and the iSCSI protocols to improve the performance. The results measured
on the prototype are encouraging, and indicating that VOSV provides the high I/O performance.
Because Toshiba quit the competition, there is only one standard of blue-ray disc: BLU-RAY DISC, which satisfies the
demands of high-density video programs. But almost all the patents are gotten by big companies such as Sony, Philips.
As a result we must pay much for these patents when our productions use BD. As our own high-density optical disk
storage system, Next-Generation Versatile Disc(NVD) which proposes a new data format and error correction code with
independent intellectual property rights and high cost performance owns higher coding efficiency than DVD and 12GB
which could meet the demands of playing the high-density video programs. In this paper, we develop Low-Density
Parity-Check Codes (LDPC): a new channel encoding process and application scheme using Q-matrix based on LDPC
encoding has application in NVD's channel decoder. And combined with the embedded system portable feature of SOPC
system, we have completed all the decoding modules by FPGA. In the NVD experiment environment, tests are done.
Though there are collisions between LDPC and Run-Length-Limited modulation codes (RLL) which are used in optical
storage system frequently, the system is provided as a suitable solution. At the same time, it overcomes the defects of the
instability and inextensibility, which occurred in the former decoding system of NVD--it was implemented by hardware.