Description:

When you run Auto-Prepare during the Prepare Hard Drive(s) setup phase of installation, if you Rollback and Auto-Prepare a second time, the process will fail with the following message:

Error partitioning /dev/sda (see /dev/tty7 for details)

Additional info:
/dev/tty7 (apologies for any typos, I actually typed this, could not cut/paste):

Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 160632, 2654208,
4096000, 7962624, 11239424, 20480000, 23887872

Writing inode tables: done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 39 mounts or
180 days, whichever comes first. Use tune2fs-c or -i to override.
Checking that no-one is using this disk right now ...
OK

Disk /dev/sda: 30515 cylinders, 255 heads, 63 sectors/track
Old situation:
Units = mebibytes of 1048576 bytes, blocks of 1024 bytes, counting from 0

Device Boot Start End MiB #blocks Id System
/dev/sda1 * 0+ 101- 102- 104422 83 Linux
/dev/sda2 101+ 360- 259- 265072+ 82 Linux swap / Solaris
/dev/sda3 360+ 7867- 7507- 7687102+ 83 Linux
/dev/sda4 7867+ 239366- 231500- 237055140 83 Linux
unrecognized bootable flag - choose - or *

sfdisk: bad input



Steps to reproduce:

1. Boot up with the netinstall iso (I used archlinux-2009.08-netinstall-x86_64.iso)
2. # /arch/setup
3. Prepare Hard Drive(s) -> Auto-Prepare
3a. select all the defaults to get through this wizard (these selections do not appear to matter)
4. Prepare Hard Drive(s) -> Rollback
5. Prepare Hard Drive(s) -> Auto-Prepare
5a. select all the defaults to get through this wizard (these selections do not appear to matter)