![]() Microsoft basic dataįinally, you should save your partition table. Next, we sort the partition table, because our EFI System partition is physically the 1st, not the 5th (as it was added). Hex code or GUID (L to show codes, Enter = AF00): EF00Ĭhanged type of partition to 'EFI System' (You will notice my HFS partition starts at 409640 - luckily, my EFI Boot partition is not overlapping with it :-) Command (? for help): nįirst sector (34-1465149134, default = 1090582672) or : 409639 ![]() Next, adding a new partition from sector 40 to sector 409639. MESSING WITH YOUR PARTITION TABLE IS DANGEROUS. IF YOU HAVE AN EFI BOOT PARTITION AT THIS POINT, THEN YOUR PROBLEM IS DIFFERENT AND MY ADVICE IS USELESS TO YOU. Notice that the EFI Boot partition is missing. Here are the gdisk commands to restore it.įirst I print my current partition table: Command (? for help): p In my case, the EFI System partition was from sector 40 to sector 409639 (yours may vary). ![]() In my case, I ran TestDisk to find the lost partition, then added it with gdisk. ( gdisk can be used from within your running OS X system - no need to boot into recovery.) To restore a lost partition, the best bet is to use TestDisk, although if you know precisely your lost partition's start/end sectors, you can use gdisk as well. ![]() While it didn't stop the system from booting, it did stop Maverick from considering it a startup-able disk. while I had an EFI partition on the disk, it was missing from the GPT. While there can be many causes (and unfortunately, the OSX Installer Log gives no hints), in my case my GPT was missing an "EFI System" partition - i.e. ![]()
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