Format of SMARTDRV status record |
| Offset | Size | Description | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
00h |
BYTE |
write-through flag (always 01h) | ||||||||||
|
01h |
BYTE |
writes should be buffered (always 00h) | ||||||||||
|
02h |
BYTE |
cache enabled if 01h | ||||||||||
|
03h |
BYTE |
driver type
|
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|
04h |
WORD |
clock ticks between cache flushes (currently unused) | ||||||||||
|
06h |
BYTE |
cache contains locked tracks if nonzero | ||||||||||
|
07h |
BYTE |
flush cache on INT 19 reboot if nonzero | ||||||||||
|
08h |
BYTE |
cache full track writes if nonzero | ||||||||||
|
09h |
BYTE |
double buffering (for VDS) state
|
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|
0Ah |
DWORD |
original INT 13 vector | ||||||||||
|
0Eh |
BYTE |
minor version number | ||||||||||
|
0Fh |
BYTE |
major version number | ||||||||||
|
10h |
WORD |
unused | ||||||||||
|
12h |
WORD |
sectors read |
may be scaled rather than absolute counts |
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|
14h |
WORD |
sectors already in cache | ||||||||||
|
16h |
WORD |
sectors already in track buffer | ||||||||||
|
18h |
BYTE |
cache hit rate in percent | ||||||||||
|
19h |
BYTE |
track buffer hit rate in percent | ||||||||||
|
1Ah |
WORD |
total tracks in cache | ||||||||||
|
1Ch |
WORD |
number of tracks in use | ||||||||||
|
1Eh |
WORD |
number of locked tracks | ||||||||||
|
20h |
WORD |
number of dirty tracks | ||||||||||
|
22h |
WORD |
current cache size in 16K pages | ||||||||||
|
24h |
WORD |
original (maximum) cache size in 16K pages | ||||||||||
|
26h |
WORD |
minimum cache size in 16K pages | ||||||||||
|
28h |
DWORD |
pointer to byte flag to increment for locking cache contents | ||||||||||