From the 1982 TRS-80 Microcomputer Catalog, Radio Shack pitched their new series of TRS' as business machines. With either 32K or 64K of RAM, the ads said said you can store "32,000 or 64,000 characters of information in the computer’s internal memory."
The disk drive provided 416,000 characters of storage - ..."on interchangeable 'floppy' diskettes. If that’s not enough, just plug in a Model II Disk Expansion Unit with one, two or three more drives. Each added drive stores another 486,000 characters, bringing the total capacity of a four-drive system to about two-million characters.
"To fill this amount of memory would require something like 96 hours of non-stop typing at 70 words per minute! Of course, a 32K Model II can be expanded to the full 64K of internal memory at any time, via our 32K RAM Add-On option."