Transportation Research Board 93rd annual meeting : January 12-16, 2014 : Washington, D.C. / Transportation Research Board of the National Academies. (OCLC #893873444)
This conference proceedings (mostly text-based papers) was distributed on a flash drive, making its content/media/carrier fields:
336 ǂa text ǂb txt ǂ2 rdacontent
337 ǂa computer ǂb c ǂ2 rdamedia
338 ǂa computer chip cartridge ǂb cb ǂ2 rdacarrier
The definition for “computer chip cartridge” in the RDA registry is:
“A carrier type consisting of a cartridge containing a miniaturized electronic circuit on a small wafer of semiconductor silicon, designed to provide additional processing, memory, or storage capacity.”
The extent, as recommended by RDA 3.4.1.3 (alternative), is much more recognizeable:
300 __ ǂa 1 USB flash drive