Abstract: A storage column structure includes multiple storage column elements that interlock together in a vertical stack to form a compact, unitary tower assembly. A power supply module is positioned as a base unit to provide stability for the tower assembly. Each of the remaining storage column elements is adapted to receive and hold a removable modular storage device, such as a disk drive mechanism. Storage column elements are electrically interconnected in the stack to provide for the storage modules held by the storage column elements electrical power and connection to preferably a SCSI bus. The storage column elements are secured together by manually turnable fasteners provided in each storage column element. With the exception of the base unit, each of the storage column elements includes a floor that supports a removable storage device module; therefore, a storage device can be inserted or removed without affecting the structural integrity of the assembly.