Editing IBM Personal Computer AT (section)

=== Storage ===
The standard floppy drive was upgraded to a 1.2&nbsp;MB {{frac|5|1|4}}&nbsp;inch [[floppy disk drive]] (15 [[Disk sector|sectors]] of 512 bytes, 80 tracks, two sides), which stored over three times as much data as the 360 KB PC floppy disk, but had compatibility problems with 360k disks (see [[#Problems|Problems]] below). {{frac|3|1|2}}&nbsp;inch floppy drives became available in later ATs.{{fact|date=January 2023}}

A 20&nbsp;MB [[hard disk drive]] was included as standard. Early drives were manufactured by [[Computer Memories Inc.|Computer Memories]] and were found to be very unreliable.<ref name="dickinson19850625">{{cite news|author=Dickinson, John|date=June 25, 1985|title=The AT's Slipped Disk|pages=55|work=PC Magazine|url=https://books.google.com/books?id=uqInkwnBdacC&pg=PA55|access-date=October 28, 2013}}</ref>