Appendix
Section 8
February 2010 Digital Talking-Book Player 56
Library Guide
8.1.2 Cartridge Serial Number Format
Each cartridge is printed with a unique serial number barcode. Libraries may choose to keep track of specific copies
of books or library purchased cartridges with this barcode. An accompanying alphanumeric code also indicates the
cartridge’s capacity and the year and lot number of its production.
The alphanumeric code is in the form MYLLL, where M is a single alphabetic character indicating the memory
capacity of the cartridge, Y is a single alphanumeric character indicating the production year and LLL are three
numeric digits indicating the lot number.
First Character of
Human Readable Code
Second Character of
Human Readable Code
Code
Memory
Capacity
Code
Production
Year
A
128MB
8
2008
B
256MB
9
2009
C
512MB
A
2010
D
1GB
B
2011
E
2GB
C
2012
F
4GB
D
2013
The barcode concatenates the capacity code, production year, lot number, sequence within the lot and the modulo 43
check digit. The form of the barcode is MYLLSSSC, where M is a single alphabetic character indicating the
memory capacity of the cartridge (as above), Y is a single alphabetic character indicating the production year (A to
Z, with A representing 2008) , LL are two alphabetic digits indicating the lot number (AA to ZZ), and SSS are three
alphabetic characters representing the sequence within the production lot (AAA-ZZZ). The last character is the
modulo 43 check digit.
Memory
Capacity
Production
Year
Lot
Number
Figure 8-5 Cartridge Capacity, Production Year, Lot and Sequence codes
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