I know there are many here who think that enterprise drives are the only way to go. I've had a conversation with Tech Support in NY and they reiterated (see below) the 'green' drive recommendation. I was also under the impression that M would only support recommended drives, which is the reason why I went with the 'green' ones. I have four in production and haven't had any issues.

Originally Posted by Meridian site for the MD600
Recommended hard disc drives

Meridian recommends Samsung HD204UI, Seagate ST32000542AS, Hitachi 0F12117 and Western Digital WD20EARS, or other comparable low power ("green") 3.5" SATA drives. We will update our recommendations on suitable HDD choices from time to time and as availability of larger capacity 3.5" SATA drives changes.

Reg

McInt MS2301, C500T, Sonus Faber Strads
Sooloos C15, MD600 2x3Tb, Twinstore 2x3Tb, 808.3, MS600