I have a G-drive connected to my mac pro running OS 10.8.2 (Mountain Lion), hosting FM Pro Server 12. The server app itself backups onto the internal drive, and then I am using a program called Chronosync to back up one of the server's internal backups to my G-drive every night. This solution will work for several days, and then will suddenly return an error, indicating that the drive will not allow itself to be written to. I am able to see the drive on my desktop, see directories on the drive, but not actually add a new backup to the drive. The solution has been to disconnect the drive and re-attach, or reboot my server (both of which are not great options). I'd like to replace my g-drive with another external drive. Does anyone know of an external drive that will work in this configuration without any issues of becoming unwrite-able over time?