Re: [ts-7000] dd and 2GB SD cards

[Mark Featherston <>]

Don,

SD cards vary slightly from card to card.  For example, I have 3 different brands of SD cards here that each say 2GB.  However according to fdisk:
ATP Industrial Grade - 2058 MB, 2058354688 bytes
A-Data Speedy SD - 2013 MB, 2013265920 bytes
Sandisk SD - 1977 MB, 1977614336 bytes

From our experience with SD cards there can be up to a 10% difference in actual usable disk size even though they are labeled for a specific size.  All of our software images take this into account and leave a portion of the disk unallocated.

Best Regards, 
________________________________________________________________
 Mark Featherston, Technologic Systems | voice: (480) 837-5200
 16525 East Laser Drive                | fax: (480) 837-5300
 Fountain Hills, AZ 85268              | web: www.embeddedARM.com 

On 01/18/2012 03:24 PM, dtucker wrote:

 

I recently went to make a backup of my 2GB SD card used as the Debian file
system for my TS-7260.

dd if=/dev/sdb of=backupfile.dd bs=2048

The resulting file was 1977614336 bytes. I then attempted to write this image
to a new 2GB SD card.

dd if=backupfile.dd of=/dev/sdb bs=2048

I received the following error:
dd: writing to `/dev/sdb': No space left on device
3842049+0 records in
3842048+0 records out
1967128576 bytes (2.0 GB) copied, 1950.22 s, 1.0 MB/s

Why wouldn't the image fit on a new SD card if it could fit on the one I copied
it from?

Don

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