I'm looking for an external drive with these criterias: - At least 20TB. - Expandable, to at least 48 TB (either via backbone or a lot of bays. The important thing is that the unit is one volume only). - Thunderbolt connection. Any suggestions? There must be a lot of people who have these kind of drives today... Synology have good devices, but I can't find them with Thunderbolt. Drobo requires an iSCSI card. Lacie have the "series 20TB" which seems very well priced. But it doesn't seem to be expandable.