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

[Phil C.]

Mark,
 
I tried resizing, but all resizing does is create an extra partition with the excess space you trim by downsizing.   If you image the SD, it still copies all sectors of the entire card including the extra partition, so this will not work.
 
I called the medical equipment company that maintains the Cpap machine and asked them to send me a blank SD card from the machine's manufacturer.
That will probably be the only way I can do this, except for doing an mbr copy on the dissimilar SD cards then copying the data.
Actually, I should of done the latter in the first place, but now I've wasted the evening, so I give up.
 
Phil
 
From: Mark Komarinski [mailto:mkomarinski at wayga.org] 
Sent: Monday, January 05, 2015 2:47 PM
To: Phil C.
Cc: hardwarehacking at blu.org
Subject: Re: [HH] Different Mfg SD Cards will not format to same size
 
Regular hard drives have the same problems which makes it fun when you try to use different vendors for a RAID array (as in, don’t, and be sure to get the exact same model for replacement drive)
 
Can you try to resize the FAT32 partition down a touch so it’s maybe 3.5GB?  Just be sure to keep the original image :)
 
-Mark
 
On Jan 5, 2015, at 2:30 PM, Phil C. <charlestek at rcn.com> wrote:
 
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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