CDPD billing records
From December 22, 2000 to January 11, 2001, spanning Christmas and New Year holidays
Sequences of 19 directories named 526 to 544:
- each directory contains up to 100 files
- each file (of 1,888) equals 15 minutes of data
Discontinuity on January 2, 2001, from 7:30 PM to 10:30 PM (directory 536 has only 88 files)