In the data center where I work we use bootable thumb drives to boot many of the servers. As far as I know, we have never had one fail. Things like user data, swap, and logs are written to HDD's (NAS). I have only had one SSD to date, a Crucial C300 which I have had for almost a year, but I know from searching that SSDs are almost expected to die. It is my understanding, and please correct me if I am wrong, that writes cause flash memory to degrade, but reads don't affect the disk. I was wondering if an SSD will be as reliable as a USB flash drive if most of the I/O is read? e.g. if other than the initial installation of the OS and updates the majority of I/O is limited to reading, what is the likelihood an SSD will fail in a 5-year time frame?