Advice on replacing a fan ?

Hi i have a Quad bay NAS from MRT essently its similer to a pc.

Ive taken it apart to check the fan because the noise was unbearable . I had planed on swaping it out for something off ebay .

i37.tinypic.com/2817td4.jpg

Unfortunitly although its the same size as a case fan its not a standard connection (Notice the lack of a third wire) so im stumped . Ive got 4x SAMSUNG HD103UJ 1TB hdds in there which are the importent thing not the 300mhz arm processor that dosnt even have a heatsync .

Can anyone suggest a way to use a standerd case fan in there or an alternitive cooling method for the hard disks .

Thanks

the fan is an 80mm 12 volt fan, runs at 2500 rpm and pushes about 25 cfm. The connection type appears to be a C-type 13mm connection, which is commonly used in devices like this and even in power supplies. This fan uses the same connection type and is rated for a similar performance (2500 rpm/32 cfm/25 dBA). It should be a drop in replacement for what you have now. If you were also interested in adding in some passive heatsinks to aid in keeping the controller logic cool, you can get this kit, which applies with simple thermal tape and should aid nicely.

Oh wait , thats the same noise level as what ive got in there now , Ive had a look for alternitives but i cant find anything close to a case fans power .

With 4 1tb hard drives so close togeather this is the only form of cooling they will recive so its importent that i get enough air in .

Isnt the third wire of a case fan just for the BIOS to display its speed , Couldnt i just chop off the third wire and insert the other two into the connector from the old fan ?