IO_WARNING_SOFT_THRESHOLD_REACHED, 0x80040090
(MS WDK >> Windows Driver Kit 8.1 (WDK 8.100.26638))

Name
IO_WARNING_SOFT_THRESHOLD_REACHED
Value
-2147221360 signed int
2147745936 unsigned int
0x80040090 heximal value
Type
Windows kernel mode error code (more)
C/C++ Type
NTSTATUS
Defined at
\Include\shared\ntiologc.h, line 301 (Windows Driver Kit 8.1 (WDK 8.100.26638))
Definition 
#define IO_WARNING_SOFT_THRESHOLD_REACHED ((NTSTATUS)0x80040090L)
Line comments 
MessageId: IO_WARNING_SOFT_THRESHOLD_REACHED

MessageText:

Disk %2 has crossed a capacity utilization threshold.
Type description
NTSTATUS is 32-bit number, which holds Windows kernel mode error codes or status codes
 

Neighbor error codes