i/o errors

Addressing physical vs. logical problems on hard disks in OS X

When managing your hard drive in OS X there are several potential problems that can crop up, including issues with the drive itself as well as those pertaining to the file setup on the drive. All of these can result in the inability to read or access files, and may, depending on the severity, result in anything from errors and brief pauses to system hangs or crashes. Apple lumps the management of some of these problems into its Disk Utility program, which is convenient but does have the effect of blending their meanings together, such as assuming a permissions fix … Read more