Hello Ivan,
My best guess is that these drives would also work in Raid 1 and as Standard drives. I have no "mission critical" things going on in my life these days and after having some data corruption / loss on a Raid 1 system, I stopped using them. The stuff that I do generate on a daily basis is backed up to 2 other devices including one at a remote location, sometimes more than once a day. I trust this and feel more comfortable a long with regular S.M.A.R.T tests and the occasional run of Scan Disk plus I have more storage capacity. When I get finished doing the some testing on a few more different brand of NAS's, I will return to do a Raid 1 format but I am not going to any long term or stress testing or failure testing to see if the Raid 1 rebuilds. I will post the results though for whoever's benefit. Take care.