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/gist:3870190

Created October 11, 2012 04:36
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Attempt to fdisk an SD card appears to work, but doesn't
Raw
gistfile1.txt
$ fdisk -e /dev/rdisk4
fdisk: could not open MBR file /usr/standalone/i386/boot0: No such file or directory
The signature for this MBR is invalid.
Would you like to initialize the partition table? [y]
Enter 'help' for information
fdisk:*1> print
Disk: /dev/rdisk4 geometry: 520/64/63 [2097152 sectors]
Offset: 0 Signature: 0xAA55
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
------------------------------------------------------------------------
1: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
2: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
3: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
fdisk:*1> disk
Disk: /dev/rdisk4 geometry: 520/64/63 [2097152 sectors]
Change disk geometry? [n] y
BIOS Cylinders [1 - 1024]: [520] 1024
BIOS Heads [1 - 256]: [64] 255
BIOS Sectors [1 - 63]: [63] 63
fdisk:*1> print
Disk: /dev/rdisk4 geometry: 1024/255/63 [16450560 sectors]
Offset: 0 Signature: 0xAA55
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
------------------------------------------------------------------------
1: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
2: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
3: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
fdisk:*1> auto dos
fdisk:*1> print
Disk: /dev/rdisk4 geometry: 1024/255/63 [16450560 sectors]
Offset: 0 Signature: 0xAA55
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
------------------------------------------------------------------------
*1: 0C 0 1 1 - 1023 254 63 [ 63 - 16450497] Win95 FAT32L
2: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
3: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
fdisk:*1> write
Writing MBR at offset 0.
fdisk: 1> print
Disk: /dev/rdisk4 geometry: 1024/255/63 [16450560 sectors]
Offset: 0 Signature: 0xAA55
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
------------------------------------------------------------------------
*1: 0C 0 1 1 - 1023 254 63 [ 63 - 16450497] Win95 FAT32L
2: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
3: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
fdisk: 1> quit
[NOW NOTE THAT THE CHANGES HAVE NOT ACTUALLY BEEN MADE]
$ fdisk /dev/rdisk4
Disk: /dev/rdisk4 geometry: 520/64/63 [2097152 sectors]
Signature: 0x0
Starting Ending
#: id cyl hd sec - cyl hd sec [ start - size]
------------------------------------------------------------------------
1: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
2: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
3: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
4: 00 0 0 0 - 0 0 0 [ 0 - 0] unused
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