The supplied update guide PDF is unreadable for me with Preview but readable with Adobe Acrobat. http://www.crucial.com/eu/support/firmware.aspx Release Date: 08/25/2011 Change Log: Changes made in version 0002 (m4 can be updated to revision 0009 directly from either revision 0001 or 0002) Improved throughput performance. Increase in PCMark Vantage benchmark score, resulting in improved user experience in most operating systems. Improved write latency for better performance under heavy write workloads. Faster boot up times. Improved compatibility with latest chipsets. Compensation for SATA speed negotiation issues between some SATA-II chipsets and the SATA-III device. Improvement for intermittent failures in cold boot up related to some specific host systems.