Stablebox is a typical example of why unlimited plans are usually very limited. Their shared hosting offers advertise "Unlimited disk space, Solid State Drives (SSD) in RAID". Their AUP policy states "By default, all accounts are provisioned with storage on Solid State Drives. Accounts using more than 5GB of disk space may be moved, at our discretion, to a server utilizing traditional hard disks for storage." Their AUP also places further restrictions on disk usage by prohibiting "Backup, archive, file upload /sharing, and mirroring sites".