dd command

[Axe]

On a Snow Leopard Mac, what is the DD command/procedure to backup a nook color micro SD card image through a USB card reader? I've seen different examples with minor variations and wanted to see what everyone here thought.

 

[roberto]

With the SD card mounted on my Mac, I use 'dd if=/Volumes/SDCard of=sdcard.img bs=1m' (substitute whatever label is assigned to the card).

 

[Axe]

Does the bs=Xm make any difference at all?

 

[irid10t]

Does the bs=Xm make any difference at all?

the bs just determines how big of a chunk is read/written at one time... so it shouldn't matter. Only time I've used it is in stripping boot loaders off the master boot record. First 512 bits are the magic, so bs=512 count=1