HP C2233 Product Description Manual page 49

DRAFT
10/24/90 11:07
and sector spares. The number of sector sparing locations
available for each drive is 2044 minus the number of total
spare track locations available for that drive. The following
table lists the track and sector spare combinations.
Drive Data Spare Tracks Spare Tracks Spare Sectors
Surfaces Per Surface Per Drive Per Drive
C2233 5 9 45 1999
C2234 7 9 63 1981
C2235 9 9
81
1963
Operating Notes
• A NO SPARES AVAILABLE error may occur for the
following reasons:
1. The user tried to allocate more track spares than are
available on the mechanism.
2. The user tried to allocate more than 2044 sector and
track spares on the entire mechanism.
3. The drive has attempted to auto-spare defect locations
at an extremely high rate (indicative of a failing
mechanism) when auto-sparing has been enabled.
• It is possible to have a sector spare on a spared track (a
defective sector exists on a track to be spared). In this
case, two tables en.tries are used: one for the track spare
and one for the sector spare on the track.
• In order to optimize sparing speed and conserve spares
allocation table space, the drive's internal defect
list processing routines will pack the list whenever
possible. For example, if three defects are detected in
three separate sectors in a single track, the defect list
processing routines in the drive will recognize the need to
assign a spare track. As a result, the three sector spare
Product Features 3-9