Go to “ Partition” tab and under ‘ Partition Layout’ section click on the pull-down menu and change the layout to “1 Partition” from “ Current”.Then just click on “Erase” and confirm the selection.Then just click on the “ Erase” tab and format the drive as “Mac OS Extended (Journaled)”.Now select drive indicating USB flash drive (select the USB drive you want to make the bootable installer) from the available drives list First connect your USB drive to the Mac computer and launch Disk Utility tool.Below is the complete step-by-step procedure to achieve this, just read on… The process involves two stages – creation of bootable USB flash drive and then installation procedure. It’s just a few simple step procedure and within minutes you can create Yosemite bootable USB. Yes! you can achieve this by just creating a bootable USB flash drive with Yosemite and then connecting it to the Mac desktop or laptop to install Yosemite from USB securely.

Who wouldn’t like to try this latest version? Every Mac user would love it! You can easily work with and get familiar with all features of this new Yosemite that too without disturbing the already running Mac installation in simple steps. Apple has recently released the beta version of the latest Yosemite OS with new and advanced features. All I can say is 'It works here.One of the most awaited Operating System of 2014 i.e. A mistake in the editing phase, can cause any kind of trouble or malfunction. Load the driver: % sudo kextload -v /System/Library/Extensions/ProlificUsbSerial.kextThat's it! As usual, there's no warranty.Change back the mode of the driver with: % sudo chmod 0555 ProlificUsbSerial.With a hex editor, open ProlificUsbSerial.Make the driver writeable: % chmod 0777 ProlificUsbSerial.

Backup the original code with: % cd /System/Library/Extensions/ProlificUsbSerial.kext/Contents/MacOS% sudo cp ProlificUsbSerial ProlificUsbSerial.old.

Unload the driver with: % sudo kextunload /System/Library/Extensions/ProlificUsbSerial.kext.

I found the cause being a rather obvious programming mistake, which can be corrected 'the hard way:' except for a very frequent message on the system log: mach_kernel: ttyioss800000x: dequeueData ret 3mach_kernel: 00000x: dequeueData ret 3(x can be anything)If you use the driver with a 56K modem, you end up with hundreds of messages per minute. The latest version of the MacOS X driver (1.0.6 as I write), works almost flawlessly. The Prolific Tech PL2303 USB to Serial port chip is used in a lot of USB connected serial-like devices, such as GPS, cellular phones and even plain serial to USB cables (for example, the IOGear or the Wiretek devices).

Usb to serial mac yosemite