Originally posted by: Red Dawn
IBM GXP Problems: The Truth Exposed
"The GMR Head technology that gives the 75GXP its stunning performance is also its major Achilles heel. As data gets packed more densely, there is less room for error. During normal operation, drives will heat up due to the friction of the platters moving through the air. While the platter is very smooth, anything running at 7200RPM will produce heat. In addition, there will heat generated by the motors and various chips used to control the drive. As we all learned in school, heat will cause metal to expand. The platters on drives are no exception. Drive manufactures know this and have chips that account for the expansion of platters. The drive head will adjust itself accordingly to ensure it is reading and writing to the right place.
In the case of the 75GXP, this does not always happen. Variables such as uneven warming of the platters can confuse the drive. Every so often, data will be recorded in one place but not where the drive was expecting. Consequently, when the drive goes back to look for the data, it is not there. A loud clicking noise, not unlike the infamous Iomega Click of Death, will come from the drive. This is due to the read head resetting itself and making another attempt to find the data.?