I had this issue and I just got my WD 640GB external drive from a Blackfriday deal recently and I was trying to format it using my Mac and I encountered some challenges but I finally found the solution by searching this keyword on Google "Partition size not a multiple of 4k"
I do not take credit for this guide but whoever did this is awesome. Saved me all the trouble and frustration.
When formatting an external HD today [Mac OS Extended Journaled(HFS+)] I ran into the following error.
“partition size not a multiple of 4k”
after a quick google search, i found the following fix:
“When formatting using Disk Utility, remember to select GUID Partition Table as your “partition map scheme” instead of MBR (Master Boot Record).”
basically do as follows:
- 1. open disk utility
- 2. select the drive
- 3. select the “partition” section
- 4. under the volume scheme select the number of partitions required
- 5. select the “options” button
- 6. make sure “GUID Partition Table” is selected NOT “Master Boot Record”
- 7. click apply
you now should be good to go and the drive should function correctly. yay!
