Don,
They seem to be the same size between batches, but within the same
model/brand there can still be size differences. Unfortunately I don't
have cards from multiple batches to show as an example.
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 04:00 PM, Don Tucker wrote:
> I tried dd'ing without specifying the block size, and had the same
> problem. I'm also copying both from and to Sandisk SDs, so unless
> there is variation in size with the same manufacturer, that does not
> explain the problem. I would just resize the partitions on the
> original SD card, but the big one is JFS, which apparently can't be
> shrunk (only grown)!
>
> Don
> On 1/18/2012 4:44 PM, Mark Featherston wrote:
>> 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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