[syslinux] cptime/memdisk block size

[Bernd Blaauw]

Is there any documentation available about what block size MEMDISK uses 
to load (big iso/harddisk) image files?

Experimenting with cptime.c32 on a Lexar Triton Jumpdrive (64GB, 170MB/s 
read in Windows, 150MB/s write in Windows) on bootable USB3.0 resulted 
in the following, depending on specified block size:
* 2048 bytes --> 25MB/s
* 2MB --> 61MB/s

It would be nice to know at which speed MEMDISK is loading, but a 
stopwatch seems a bit crude as only method.

Bernd