MB only seeing one of my 2 m.2 drives

[fastboy]

ok I'm having a bit of a problem

I have been running 3 normal ssd's but decided today to swap them out for a couple of m.2 sata drives so I got a crucial mx500 500gb and a western digital 250gb

the problem is my mb has 2 m.2 slots but it only shows 1 of the drives up,its like only the top slot ( the m.2-1 slot) is picking any of the drives up,if I put my mx500 in that slot it lights up blue and works fine,if I put it in the lower m.2-2 slot it lights up red and doesn't get picked up.

any ideas?

MB is asrock matx pro 4

 

[fastboy]

yes the m.2 sata drive only works in one of the m.2 slots,the top one even if I have no other drives attached.
having checked on the asrock website from what I can gather you can only run 1 m.2 sata drive,the other has to be pci-e

a big fat DOH !!



* * If M2_1 is occupied by a SATA-type M.2 device, SATA3_0 will be disabled.
• 1 x Ultra M.2 Socket (M2_1), supports M Key type 2230/2242/2260/2280 M.2 SATA3 6.0 Gb/s module and M.2 PCI Express module up to Gen3 x4 (32 Gb/s)**
• 1 x Ultra M.2 Socket (M2_2), supports M Key type 2230/2242/2260/2280 M.2 PCI Express module up to Gen3 x4 (32 Gb/s)**

 

[fastboy]

hi
I have nothing plugged into any sata ports on the mb

yes it auto disables the 3-0 sata port if the m.2 sata-1 slot is used.

quoted from the asrock website:

6 SATA3, 2 Ultra M.2 (One supports PCIe Gen3 x4 & SATA3, the other one supports PCIe Gen3 x4 only)


so looks like I will have to get rid of one of my m.2 sata drives and get a pcie m.2 instead