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Last active October 15, 2019 17:07
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Resizing OSX virtualbox guest partition
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README.md

Expand virtual hard drive

VBoxManage modifyhd OSX\ Dev.vdi --resize 40960

Resize GPT

Solves "MediaKit reports partition (map) too small" error from Disk Utility

  • Mount virtual image via nbd sudo qemu-nbd -c /dev/nbd0 OSX\ Dev.vdi
  • Use sudo gdisk /dev/ndb0 to destroy and recreate a partition table.
  • Unmount virtual image sudo qemu-nbd -d /dev/nbd0

Fix volume information headers

Solves "Couldn't modify partition map because file system verification failed" error from Disk Utility

  • Boot OSX in single user mode (pass -s to bootloader)
  • fsck -fy

Actually resize partition

  • Boot OSX normally
  • Open Disk Utility
  • Select (now larger) drive on left
  • Partition tab
  • Drag up and then down
  • Click Apply

Done!

@fdelapena
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@ytsamy try this approach:
http://blog.kyodium.net/2010/11/increase-disk-and-partition-size-in.html
In recent OS X there are multiple entries for EFI, but read the latest comment to learn how to play with them.

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