With the rapid development of information technology, the need for data storage is growing, and the requirements for I/O performance are getting higher and higher. Compared with the traditional Hard Disk Drive (HDD), Solid-State Disk (SSD) has more advantages such as high availability, low energy consumption, no seek time, etc. Due to these reasons, SSD gradually replaces HDD to become mainstream storage media. The OpenSSD project is an initiative to promote research and education on the recent SSD technology by providing easy access to OpenSSD platform on which open source SSD firmware can be developed. In this study, we investigated the Flash Translation Layer (FTL) algorithm on the Cosmos OpenSSD platform, analyzed all kinds of factors that affect the I/O performance, designed a way to carry out the buffer management and flash management, and finally improved the I/O performance effectively.