The primary business tools were located at the
main office, so all work essentially stopped until the line was repaired.
Media
Hard drives and tape drives have one major weakness??”they??™re magnetic media, which
means they can be corrupted easily if put in the proximity of a magnetic field. These
devices also contain moving parts, which are prone to break. Here??™s a list of some types
of media failures that you might encounter in the field:
??? Failing disk drive: In this simple and common failure, a single drive in a disk array
begins to acquire bad sectors. Within a week, it fails outright.
??? Corrupted active backup tape: An active tape used in a backup rotation becomes
corrupted, retaining only a portion of the information it should be storing.
??? Damaged archival tape: An archived tape, being stored offsite, becomes damaged
and entirely unreadable, probably due to being dropped or placed on top of a TV
or monitor.
Process
I define process errors a little differently than most. A process can be one of these two
things:
??? An automated program or script that runs unattended
??? A manual process performed on a scheduled basis, either reoccurring or once
CHAPTER 1 n WHAT IS DISASTER RECOVERY? 7
You might argue that a mistakenly executed manual process is a form of user error,
but these types of errors fit more closely with automation in terms of likelihood, impact,
and predictability.
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