http://www.romexsoftware.com/en-us/primo-cache/index.html

PrimoCache is a supplementary software caching scheme that cooperates with system memory to provide data caching for disks. It improves system performance by transparently storing data into memory such that future requests for that data can be served faster. PrimoCache caches data on a logical block basis (offsets within a disk) while windows cache manager caches on a virtual block basis (offsets within a file).
PrimoCache can also utilize the OS Invisible Memory which is wasted on 32-bit Windows when 4GB memory or more is installed.
Principle
One of the PrimoCache's core components is a storage class filter driver which resides in the storage stack, intercepting I/O requests for data on disk. If requested data is contained in the cache, this request can be served by simply reading the cache, which is comparably faster. Otherwise the data has to be fetched from disk. Hence, the more requests can be served from the cache the better the overall system performance is.
FancyCache Principle Fig. 1
FancyCache Principle Fig. 2
Main Features
Supports LRU (Least Recently Used) and LFU (Least Frequently Used) cache algorithms
Supports caching strategies: Read/Write Caching, Read-Only Caching and Write-Only Caching
Supports Write-Through and Write-Deferred modes
Supports OS Invisible Memory
Supports SSD (Solid-state Drive) as Level-II cache
Supports persistent caching
Supports caching for multiple volumes
Supports TRIM command
Supports visual performance monitor
Supports cache plug and play
Supports basic and dynamic disks
Supports NTFS junction point
Supports volume with proprietary file system
Why PrimoCache?
Why do we need another cache scheme since Windows OS has already implemented a file-system level cache?
Some applications bypass the file-system level cache.
Windows caches all data, while PrimoCache can cache on behalf of a specified volume in which users are interested. Given same size of system memory, the latter has a higher hit-rate.
PrimoCache can utilize the OS Invisible Memory on 32-bit Windows as a cache medium.
PrimoCache can utilize SSD (Solid-state Drive) as a cache medium, as ReadyBoost does.

PrimoCache Main UIPrimoCache UI 2
Supported OS
All versions of Windows XP, Windows Vista, Windows 7, Windows 8, Windows Server 2003, Windows Server 2008 and Windows Server 2012, including x86 and x64 editions.

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