SCSI2SD Imaging
It means that to get all 512MB of our ADFS image stored on the SD card, we actually need to copy 1024MB bytes. The command dd can do some clever things, but what it can't do is to discard the data we don't want - either in the IDE format or the SCSI2SD format - so when we have created the image file, some processing into a valid ADFS disc image will be required. That, as they say, is for another time.