Or, as some have asked: “Holy sh*t what is this Cruise Control thing doing to my drives!?”
The new FlexRAID Cruise Control interface takes control of your drives in order to automate a lot of things for you. Indeed, FlexRAID dismounts them from their letter, and mounts them as a folder in a protected path. As a result, you won’t see them anymore in the “My Computer” window.
There are many reasons for that.
The first reason is that, once the drive is pooled, you should be accessing it only through the pool. Indeed, accessing the same files from the pool and directly from the drive can create locks and contentions. See here.
Second reason is to prevent your drives to spin up each time an explorer window is opened, just because it displays them in My Computer.
See this article for more reasons as to why folder mounts are more appropriate when used with FlexRAID. This process was recommended with previous versions, it is now automatically done by the Cruise Control mode.
It can be a little daunting at first as it starts to take control over your drives, but fear not. The new interface channel the same data safety with minimal intrusion as before (the only intrusion is controlling the mount point of your drives). Dismounting the letter and mounting the drive as a folder is an easy process that is perfectly reversible, and does not impact a bit of your data.
In particular, when you remove a drive from the pool, its original letter is automatically restored. And when you delete the Cruise Control configuration, all letters are restored as they were before pooling the drives. You can also remount them as letters manually using Windows storage management console.
Note that, if for some reasons you still do not like your drive letters to disappear and want to continue controlling your drives, the Expert mode will let you control it.
This article explains how to mount them as folders, and dismount the letters. You can follow the same steps to re-mount the letters.