Technical information

HGST Ultrastar C15K600 Hard Disk Drive Specification
149
- DEVICE CACHE FULL READ HITS
The number of times that all of the data requested by the read operation was obtained from the device read or
write cache.
- DEVICE CACHE PARTIAL READ HITS
The number of times that a portion, but not all, of the data requested by the read operation was obtained from
the device read or write cache. A physical operation to the device media was required to obtain the remaining
data.
- DEVICE CACHE WRITE HITS
The number of times that the data associated with a write operation replaces, or is combined with, existing data
in the device write cache, thereby eliminating a write operation.
- DEVICE CACHE FAST WRITES
The number of times that space was available in the device write cache for the data associated with a write
operation and a response was returned immediately.
- DEVICE CACHE READ MISSES
The number of times that none of the data requested by the read operation was obtained from the read cache.
The statistics reported by this page are lost on a self-initiated reset or when the Drive is powered off.Even though the
DS field equals zero, the parameters on this page are not savable.