5 MB Hard Drive  (260-1130)         Features           Faxback Doc. # 5066

The TRS-80 5 MB Hard Disk Unit consists of two non-removable 5.25" disks.
There are four Read/Write heads (one on each side of each platter) which 
move towards or away from the center of the disk as needed.

The Disks and Read/Write heads are fully enclosed in a sealed chamber. A
special air filtration system prevents dust and other particles, which 
destroy data, from reaching the disks. Another filtering system allows 
pressure equalization with the "outside" air pressure.

UNDER NO CIRCUMSTANCES MUST THE CHAMBER BE UNSEALED IN THE FIELD. A CLASS 
100 CLEAN ROOM ENVIRONMENT IS NEEDED FOR UNDER-THE-BUBBLE REPAIR.

On all Hard Disk Units, flaws in the media are identified at the factory
before the disk drives are delivered to the customer. Attached to the bottom
of each disk drive unit is a "Media Error Map". This map identifies the 
flawed tracks on that particular unit.


(smm 07/29/93)