NAS Queries RN214

You are thinking of a NAS like a multi-drive USB dock.  It's not at all like that.  A NAS is a computer running a Linux based operating system with hardware and software optimized for file sharing and RAID.  It's more like a server.

You can restrict users or groups of users to specific shares.  You can put separate volumes on separate drives and put those shares on specific volumes if you so choose, but it's not necessary for the kind of security you are looking for and is a lot more work than necessary.  Typically, you would have one RAID data volume and many shares.  The Admin user, of course, has full access to all data.

The user limit for Linux used to be 64K, but that has changed to something over 4 million.  But one of the Netgear employees will have to let you know if there is a secondary limit in the ReadyNAS OS linked to the GUI and/or ReadyCloud.  Of course, not all those could ever log on at once, but that's not what you are looking to do.  You should state how many users you expect to be using the NAS concurrently so you can get advise on whether the 200 series is enough NAS for you.

Since you are so interested in drives, I'm wondering if you are thinking you can remove the drive once a customer has left you.  If you have separate volumes on separate drives, you can.  But putting those volumes back in and accessing them is not supported.  If I'm reading too much into your plans, then just ignore this.