Last time my Mac had some startup problems and I went to the Genius Bar for a clean OS installation. The technician took out a hard drive called “KG” and booted my Mac from a recovery partition on it.

Just for curiosity, I want to know what are included on the “KG” drive. During booting, I saw a lot of normal and recovery partitions of different macOS versions. It would be interesting to know what other partitions/special tools are on the drive (and perhaps it would be handy for me to have a similar drive if I encountered similar problems again).

The only thing I know is the appearance. It should be a LaCie 2TB Rugged Thunderbolt + USB-C, with the “LACIE” trademark replaced by an Apple logo and the two uppercase characters “KG”. I think the words “Genius Bar” are also printed on it, if I recall correctly.

Any help is appreciated.


There's no way anyone here can know what exactly was stored on a specific hard drive handled by an unspecified technician in an unspecified location. You should ask the technician if you can instead.

The contents on that hard drive has most possible changed numerous times between then and now. There's no guarantee in any form that any "KG" drive has the same contents as any other "KG" drive across countries, stores, technicians, etc.

In practical reality, there's really no chance for you to get an exact copy of that technicians hard drive at the time of your repair.

Moderne Macs have recovery partitions on their hard drives or SSD by standard. They also contain internet recovery within the flash portion of their main board - so even if you replace the hard drive or SSD, you'll be able to boot from that and reinstall macOS or alternatively fix problems with the drive.

  • First, I don’t mean to ask for a “copy”, and recovery partitions can be prepared quite easily. Besides, my initial thought was that those “KG”s were from a pool, not belonging to individual technicians. Finally, sometimes a stable internet connect is unavailable, and having a local recovery partition will be useful in that case. – tonychow0929 Nov 3 '18 at 6:08
  • A local recovery partition is included on a standard Mac. As you mention, you can also create one quite easily. – jksoegaard Nov 3 '18 at 7:28

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .