C.4 The 64-bit Offset Format
The netCDF 64-bit offset format differs from the classic format
only in the VERSION byte, \x02 instead of \x01, and the OFFSET
entity, a 64-bit instead of a 32-bit offset from the beginning of the
file. This small format change permits much larger files, but there
are still some practical size restrictions. Each fixed-size variable
and the data for one record's worth of each record variable are still
limited in size to a little less that 4 GiB. The rationale for this
limitation is to permit aggregate access to all the data in a netCDF
variable (or a record's worth of data) on 32-bit platforms.
