I haven't updated my MacBook Pro in many years. In fact, I'm still on Snow Leopard (MacOS X 10.6.8). This is a version so old that all the steps I read to make a bootable USB drive failed. I wasn't able to use createinstallmedia to make a boot disk because that doesn't work until MacOS X 10.7. Nearly all the steps I read online regarding using "Disk Utility" to make a bootable USB drive failed until did the following steps:
General steps This is the step door step guide for link to toon u how to convert video (including HD video, MKV, WMV, AVCHD, AVI, MOV, FLV, MOD, TOD, etc.) to portable device, appel, apple optimized format of HD MKV, WMV, AVI video.