Placement of VBR Video Data on MZR disks

Recently, disk zoning techniques have been widely used for increasing disk drive capacity. As a side effect, data transfer rates for outer zones of a hard disk are much higher than those of inner zones. Without giving proper care to disk zoning features, disk bandwidth cannot be utilized e ectively. In this paper, we propose a data placement scheme for VBR (Variable Bit Rate) video objects, called NCTT (Near Constant Transfer Time). NCTT considers the nature of the VBR, the MZR disk characteristics and the popularity of video objects to e ectively place the blocks. In NCTT, the disk blocks of a video object are placed so as to have similar transfer times, i.e, it takes a similar time to retrieve each disk block. Through extensive simulations, we compared the performance of NCTT with existing schemes. The simulation results show that NCTT utilizes the disk bandwidth e ectively and supports more users than existing schemes.