Andrew B's idea is interesting. According to the blurb, the drive identifies files that are accessed regularly and stores them in the flash portion of the drive. The time shift buffer is saved in the file '0.TS' and if this file were written in the flash portion, the normal platter would be written to less. I have read that the flash portion of the drive I mentioned above is only 8GB. This is fine for running an OS, but I just checked one of my machines and 0.TS is 17.6GB: I think the Humax reserves 20GB. So even if the flash portion were used to write this file, the capacity would be exceeded after a while and the drive would have to write to the normal platter.