How to use this BLDC and know more about it?
These are fun to play with and a good introduction to BLDC technology.

Technically it is a 3 phase BLDC motor with 9 stator arms and 12 magnet poles, probably 'Star' wound, with analog Hall sensors. If it came from a standard size (5.25") CDROM drive then it is probably rated for 12V (but will run on less) and draws less than 1A in normal operation. 

To drive it properly you need a BLDC controller. You can try to make one with a dedicated sensored controller chip like I did, but getting the wiring right is tricky (25 different different ways it could be connected, and only 2 are correct!). Alternatively just use a standard 'RC hobby' brushless ESC, and solder the ESC's phase leads directly to the windings (no need to connect the Hall sensors).

For even more fun you can try rewinding it and replacing the Ferrite 'ring' magnet with Neodym magnets for more power.

If you do an Internet search for 'brushless CDROM motor' you should find many examples of driving them with an Arduino etc.