== Writing SD Cards: Mac OS X ==
Apple provides a copy of dd with recent releases of OS X (at least since 10.7, probably earlier).

'''Finding the SD card descriptor:'''[[BR]]
 1. Insert the SD card
 1. In a terminal run {{{diskutil list}}}. Look for the SD card in the list of disks. On a MacBook with a singe hard drive, the output is:
{{{
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.1 GB   disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:                  Apple_HFS Macintosh HD            499.2 GB   disk0s2
   3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:     FDisk_partition_scheme                        *2.0 GB     disk1
   1:                 DOS_FAT_32 WARP SD                 32.0 MB    disk1s1
}}}
 2. In this example, the SD card device descriptor is {{{/dev/disk1}}}. The actual descriptor will differ on other machines with different disk configurations, but should take the form {{{/dev/diskX}}}.

'''Copying the .bin file:'''[[BR]]
 1. Unmount ('''not''' eject) the drive using this command (replacing {{{X}}} with your actual SD descriptor):
{{{
diskutil unmountDisk /dev/diskX
}}}
 1. Run this command, replacing the last three arguments with the correct values:
{{{
dd bs=512 seek=<N> if=<yourFile.bin> of=</dev/diskX>
}}}
  1. ''<N>'': depends on the target slot number; use (131072 + slotNum*32768). More details [wiki:..#Copying.binFilesSDCards here].
  1. ''<yourFile.bin>'': the binary FPGA configuration file
  1. ''</dev/diskX>'': device descriptor for the SD card
 1. If successful, dd should report the following (the time/throughput values will differ):
{{{
18032+1 records in
18032+1 records out
9232444 bytes transferred in 8.503631 secs (1085706 bytes/sec)
}}}
 1. Repeat for additional .bin config files in additional slots if needed.
 1. Eject the SD card in the Finder (if it's mounted).