This is weird, the 9260 have recognized anything I've thrown at it.

Do you happen to have any other drives you could try connecting, anything will do.

It could be the cables or power or that it's not compatible which I highly doubt, anything is possible though.
Did you buy the KIT with the SATA cables or did you get some other cables?

My WD1001FALS drives are used in a raid, otherwise I would have checked myself.