What is the difference between IDE, SCSI and VirtIO drives? Which do you recommend?

If you’re not sure then you should stick with the IDE emulation, which offers good performance and compatibility. However, we believe that VirtIO drive types provide the best performance, and these are what our preinstalled images use by default.

Note that our virtio drives have writeback caching enabled, so you will need Linux 2.6.32 or later, which supports barriers over VirtIO, to be able to use these safely. If you’re not using one of our recent preinstalled images, VirtIO disk drivers must be installed specifically within Windows before you can use this disk type.