Gestetner A193 Service Manual page 801

If any bad sectors are detected during hard disk operation, the sector will be
skipped. The controller will find the next good sector.
If the hard disk fails, the sort function will disappear when the machine is
switched off/on. Also, the "HDD Installed" message will disappear from the
test page.
2.5 Features
2.5.1 Sorting Function
If "Sorting" is turned on and a multicopy job is printed, the rendered image of
each page in the job is stored on the disk first. The controller then sends
page images to the machine page by page until all copies in this job are
printed out.
If the face up tray is selected as the output tray, the page order sent to the
engine will be reversed (last page first).
Even if "Sorting" is set to on, there are two cases in which the print job does
not go through the hard disk. One case is when there is only one page in the
print job and the face up output tray is selected. The other case is when there
is only one set of pages in the print job and the face down output tray is
selected.
(A643) 1-12 SM