The player plays DTBs stored on USB flash drive cartridges. These cartridges contain a type of solid state memory that is nonvolatile and can be rewritten thousands of times. They are resistant to damage by extremes of temperature, humidity, and other environmental conditions expected to be encountered by patrons and libraries.

The cartridge has a feature that enables erasing or rewriting of the contents, but only by authorized parties. Thus, it is impossible for patrons to inadvertently or maliciously alter the contents of the book.

Cartridges are manufactured in several sizes. The nominal capacities are 128 MB, 256MB, 512 MB and 1 GB. About 65 percent of NLS DTB titles are less than 128 MB in size, 30 percent are between 128 MB and 256 MB, and just 5 percent are larger than 256 MB.



Cartridges accommodate a print and braille label in a slightly recessed area to protect the embossed braille. This label contains two 30-point print lines, four large-print (14-point) lines, and five rows of book information in braille. The underside of the cartridge has an area available for a library-specific label or identifier.



The cartridge has mechanical features that assist handling by physically handicapped persons. It can be inserted into the player in only one orientation.

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