noun
access arm
In computing, the mechanical component of a disk drive that positions the read/write head over the correct track.
ハードディスクのアクセスアームが故障すると、データの読み書きができなくなる。
If the hard disk's access arm fails, data can no longer be read or written.
Variant with interpunct, sometimes seen in technical writing.
Borrowed from English 'access arm', a technical term in computer hardware.