[HH] Different Mfg SD Cards will not format to same size

[Phil C.]

I have an 4GB SD Card with data from my Sleep Apnea CPAP machine I have to
clone to another SD card to send to the doctor for analysis.
 
The card that came with the machine was formatted FAT32 to 3.72GB.   I
bought a Sandisk 4GB SD card and popped it in the reader and found it will
only format to 3.69GB
 
I'm using Win32 Disk Imager for the cloning, and as far as I know I can't
clone 3.72GB into 3.69GB.    The souce SD has some kind of proprietary
header or something in there so that I just can't copy the files.
 
I just can't figure out why the two 4GB SD cards have different formatted
capacities.
 
Phil
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