I just tested VeloSSD, and it works perfectly. However, in contrast to solutions like Intels Smart Reponse or Dataplex NVelo, I am missing an option in VeloSSD (which currently is my favorite).
As far as I understand what the software does from the description on this forum, it seems it uses the SSD as a read cache as well as a write cache for the HDD.
If this is correct, is there any option (or other way) to select only read cache mode? During my tests it wrote around 50GB of unnecessary data to the SSD just while copying some bigger files from a network drive to the HDD. Normally it should make way more sense to just cache regularily accessed data to the SSD, not any data going from somewhere to the HDD.
Disabling the write-back cache (or at least doing a write-through cache) would also help in keeping inconsistencies between SSD and HDD (and in result incorrect data on the HDD) away, in case the SSD malfunctions or the system crashes during disk writes.