usb drive issue

I put a flash drive in to a booted system and it would not auto-mount, nor could I mount it manually.

I ran modprobe -l | grep usb-storage and got an error, infact modprobe itself could not execute due to not finding a file. ??? I rebooted and saw that it loaded, and the usb drive now works. However, it is /dev/sdb. Previous to detecting this device, I had 3 internal hard drives as raid 5 as devices sdb, sdc, sdd, forming , md0. If the device mappings are shifted does this affect the raid or is md0 able to map correctly to the new mount points for these drives?

cat /proc/mdstat looks good BUT

fdisk shows all my HDDs that make up my raid and md0 with invalid parition tables. Is this related to the usb drive/mapping or is this likely to be from the power outage that recently brought it down.

Thanks,
WT