WD10EARS, WD10EVCS, WD10EVDS, WD10EURS. FWIW we've had the WD10EVCS in our Series3 for a little over two years (or maybe more?) and it's been flawless. BTW, all but the WD10EARS are A/V dedicated drives which means they run a little more quietly. However you can easily adjust the AAM (auto acoustic management) on WD10EARS to 128 by using HDDScan to reach the same level. Details are in the FAQ (Section IV, #32). These model drives manufactured prior September 15, 2010 had to have the Intellipark feature adjusted to avoid a boot or reboot issue. However by all reports everyone is getting drives manufactured after that from the major suppliers now (Amazon, Newegg, etc.) so you shouldn't have any worries. Happy upgrading!