Umm i use a few different models, between 1TB to 4TB portable drives, i had an older model of this rampage board and they worked fine on it so the drives aren't the issue., thanks for your reply.
i7 4930k, Asus Rampage Extreme IV Black Edition, EVGA GTX 690, Corsair Dominator Platinum 32GB 2400Mhz, Asus ROG RAIDR 240GB, OCZ Vertex 4 240GB, Creative Sound Blaster ZxR, Corsair AX1200i, Corsair H100i, Win 8.1
Yer I'm pretty sure, there hasn't been many updates for the party few months anyway, but I do use that auto update environment that asus have to make sure everything is up to date, cheers*
i7 4930k, Asus Rampage Extreme IV Black Edition, EVGA GTX 690, Corsair Dominator Platinum 32GB 2400Mhz, Asus ROG RAIDR 240GB, OCZ Vertex 4 240GB, Creative Sound Blaster ZxR, Corsair AX1200i, Corsair H100i, Win 8.1
What speeds are you considering as slow? 80 MB/s? External HDDs are always slow compared to thumbdrives. While I get 80 MB/s to 90 MB/s with an external HDD I easily get 230 MB/s with a thumbdrive. And 230 MB/s is the specified maximum of that drive.
I don't like the ASUS software. It's not well made. For example they released a new BIOS for my board but neither BIOS nor their Updater software could find a new version. I downloaded it manually and tried flashing it using their AI Suite III software thingy. It said "flashing successful" but when I checked I still had the old BIOS. I tried it again but no chance. I then flashed it directly in the BIOS and it worked as intended.