head crash

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun computing A collision of the head of a hard drive with the platter, resulting in irreparable damage to the hard drive.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun (computer science) a crash of a read/write head in a hard disk drive (usually caused by contact of the head with the surface of the magnetic disk)