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User data analysis in high energy physics presents a challenge to spinning--disk based storage systems. The analysis is data intense, yet reads are small, sparse and cover a large volume of data files. It is also unpredictable due to users' response to storage performance. We describe here a system with an array of Solid State Disk as a non--conven@onal, standalone file level cache in front of the spinning disk storage to help improve the performance of LHC ATLAS user analysis at SLAC. Thedoi:10.1088/1742-6596/513/4/042035 fatcat:lobhtkovfzgl3fxfiocekfouja