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. 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