Due to continuous growth in speed of processor and comparatively slower speed growth in disk I/O operations, disk I/O operations are always area of concern for all. Seek time and rotational latency is the major component in I/O operation performance. Performance of modern disks is adversely affected because of slow I/O operations. To address this issue, two approaches are preferred. One is hardware improvement and other is software enhancement i.e. I/O and disk schedulers enhancement. This paper collectively presents different approaches related to hardware and software.