RAID with WD RED 2TB WD20EFRX + WD20EFAX ** URGENT **

Hi,

I have got one new-packed Disk WD RED 2 TB and i would like to configure it in RAID 1 with other drive still to buy.
I discoverd in amazon the same disk with description “WD20EFRX”, but I find only “WD20EFAX”.
Apparently they seem to have the same characteristics ( Western Digital WD Red 2 TB NAS hard disk interno 3.5", 5400 RPM Class, SATA 6 Gb/s, CMR, 64 MB Cache).
Are there any differences / incompatibilities/interoperability?

Do you think I can proceed with the purchase and configure them together in my new QNAP TS-251D?

Thanks in advance for your suggestions.

Alessio

Hi @Alessio_prd,

Please be informed that WD20EFRX has 64 MB Cache memory and WD20EFAX 256 MB Cache memory.

For more information, please contact the WD Technical Support team for best assistance and troubleshooting:
https://support-en.wd.com/app/ask