Current file compression programs are not designed to allow
random access to parts of a compressed file, so the disk-based space/time tradeoff
principle cannot easily be taken advantage of in normal processing using commer-
cial disk compression utilities. However, in the future disk drive controllers might
automatically compress and decompress files stored on disk, thus taking advan-
tage of the disk-based space/time tradeoff principle to save both space and time.
Many cartridge tape drives (which must process data sequentially) automatically
compressand decompress information duringI/O
------解决方案--------------------
目前的文件压缩程序不是为了随机访问压缩文件而设计的，所以基于磁盘的空间/时间压缩的折中方案不会轻易地被普通的基于商业的磁盘压缩技术所利用起来。但是在将来，磁盘驱动控制器也许会自动压缩和解压存储在磁盘上的文件，如此利用基于磁盘空间/时间压缩的折中方案会用来节省空间和时间。很多的磁带驱动（只能顺序处理数据）会在执行I/O操作期间自动的压缩和解压信息。