Honeywell 6000 Series Reference Manual page 46

Before recoverable errors becoIne nonrecoverable, you should declare the suspect
track defective and relocate its data to an alternate track. H Inore than a single error occurs
on a track Within one week, copy the entire disk pack onto another preformatted disk pack,
or declare the track defective and redistribute the data on the disk
pac~.
When a nonrecoverable read error occurs, do not relocate the data to an alternate
track, or declare the track defective. Instead, restore the data to the user file affected.
An alternative is
to
move the disk pack to another disk pack drive and retry the operation.
H this procedure fails, reconstruct either the disk pack or the user file.
It is also possible to get errors during a write operation. In these cases, alternate
tracks should be as signed.
In disk storage unit operations, InoInentary contact of heads and recording surfaces
is nOrInal. Therefore, surface markings on the recording surfaces can be ignored Uilless
they are accompanied by operational problems.
SUBSYSTEM CONTROLS AND INDICATORS
Controls and indicators for the subsystem consist of operating, configuration, and
maintenance switches and operational status display lamps. Operating controls and indicators
are used during the" normal operations of the subsystem and are easily accessible and
visible to operations personnel. Operating controls and indicators are located on the DSC
operator panel and the DSU operator panel. Configuration switches are set only during the
initial installation or reconfiguration of the subsystern. To prevent changing these switches
during normal subsysteIn operation, they are not easily accessible. The maintenance
switches and indicators are for the exclusive use of the service engineer for offline main-
tenance. They, also, are not easily accessible. Only normal operating controls and indi-
cators are described in this manual.
DSC Operating Controls and Indicators
The DSC operator control panel contains the switches and indicators required for
normal operation of the DSC (see Figure 3 -1). The color coded indicators display the
operating status of the DSC.
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