Certain aspects of the present disclosure relates to a system having a virtual desktop server (VDS). In operation, the VDS is configured to: create a random access memory (RAM) disk in a memory; partition the RAM disk into a two partitions, one for caching first data received from instances of pooled virtual machines (VMs), and the other for caching second data received from personalized VMs; create a data store in a storage device, including two portions for preserving the first data and the second data respectively; and perform a plurality of data write through operations based on VM types. The write through cache operations may include: disabling data write through for the first data; and enabling the data write through for the second data.