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Here are the required steps:

1. Connect to your Mac a properly formatted 8GB (or larger) drive, and rename the drive Untitled. (The Terminal command used here assumes the drive is named Untitled.) Also, make sure the Yosemite installer, called Install OS X Yosemite.app, is in its default location in your main Applications folder (/Applications). This means that if you moved it before installing Yosemite, you need to move it back before making your installer disk.
2. Select the text of this Terminal command and copy it:
3. Launch Terminal (in /Applications/Utilities).
4. Warning: This step will erase the destination drive or partition, so make sure that it doesn’t contain any valuable data. Paste the copied command into Terminal and press Return.
5. Type your admin-level account password when prompted, and then press Return.
6. The Terminal window displays the progress of the process, in a very Terminal sort of way, by displaying a textual representation of a progress bar: Erasing Disk: 0%... 10 percent...20 percent... and so on. The program then tells you it’s copying the installer files, making the disk bootable, and copying boot files. Wait until you see the text Copy Complete. Done. (see the screenshot above), which could take as long as 20 or 30 minutes, depending on how fast your Mac can copy data to your destination drive.

You now have a bootable Yosemite install drive. If you like, you can rename the drive from its default name of Install OS X Yosemite, though I think it’s kind of a catchy name.

Option 2: Use Disk Utility

You’ll find Disk Utility, a handy app that ships with OS X, in /Applications/Utilities. Here are the steps for using it to create your installer drive. The procedure is a bit more involved with Yosemite than it was for Mavericks (which was itself a bit more involved than under Mountain Lion and Lion).

After downloading the OS X 10.10 Yosemite instakker from the Mac App Store, just quit the installer and set the downloaded file's name to Install OS X Yosemite.app. Install Yosemite Dmg From Usb Adapter. Use the 'createinstallmedia' command in Terminal. Sep 03, 2015 Download Mac OS X 10.10 Yosemite.DMG – Download Yosemite.ISO – Yosemite Torrent download – VMWare image – Hackintosh Without. Once your USB drive is done formatting, right-click it again and click “Restore with Disk Image”. A file selection window will pop up; choose your Yosemite Zone disk image file (it will probably be called “Yosemite-Zone.dmg”), and proceed. Now, TransMac will write Yosemite Zone onto your USB drive. A DMG file, like ISO, can be used to install macOS operating system or Mac apps. If the Mac computer was broken or crashed and couln't get into the system, but you only have access to a Windows PC, there's still a way to make a bootable macOS install USB on Windows.

1. Once you’ve downloaded Yosemite, find the installer on your Mac. It’s called Install OS X Yosemite.app and it should have been downloaded to your main Applications folder (/Applications).
2. Right-click (or Control+click) the installer, and choose Show Package Contents from the resulting contextual menu.
3. In the folder that appears, open Contents, then open Shared Support; you’ll see a disk image file called InstallESD.dmg.
4. Double-click InstallESD.dmg in the Finder to mount its volume. That volume will appear in the Finder as OS X Install ESD; open it to view its contents.
5. Several of the files you’ll need to work with are hidden in the Finder, and you need to make them visible. Open the Terminal app (in /Application/Utilities), then type (or copy and paste) the following command, and then press Return: (This tells the Finder to show hidden files—we’ll re-hide such files later.)
6. Launch Disk Utility (in /Applications/Utilities) and then drag BaseSystem.dmg (in the OS X Install ESD volume) into Disk Utility’s left-hand sidebar.
7. Select BaseSystem.dmg in Disk Utility’s sidebar, and then click the Restore button in the main part of the window.
8. Drag the BaseSystem.dmg icon into the Source field on the right (if it isn’t already there).
9. Connect to your Mac the properly formatted hard drive or flash drive you want to use for your bootable Yosemite installer.
10. In Disk Utility, find this destination drive in the left sidebar. You may see a couple partitions under the drive: one named EFI and another with the name you see for the drive in the Finder. Drag the latter—the one with the drive name—into the Destination field on the right. (If the destination drive has additional partitions, just drag the partition you want to use as your bootable installer volume.)
11. Warning: This step will erase the destination drive or partition, so make sure that it doesn’t contain any valuable data. Click Restore, and then click Erase in the dialog box that appears; if prompted, enter an admin-level username and password.
12. Wait for the restore procedure to finish, which should take just a few minutes.
13. Open the destination drive—the one you’re using for your bootable installer drive, which has been renamed OS X Base System. Inside that drive, open the System folder, and then open the Installation folder. You’ll see an alias called Packages. Delete that alias.
14. Open the mounted OS X Install ESD volume, and you’ll see a folder called Packages. Drag that folder into the Installation folder on your destination drive. (You're replacing the deleted Packages alias with this Packages folder.) The folder is about 4.6GB in size, so the copy will take a bit of time, especially if you’re copying to a slow thumb drive.
15. Also in the mounted OS X Install ESD volume, you’ll find files named BaseSystem.chunklist and BaseSystem.dmg. Copy these files to the root(top) level of your install drive (OS X Base System, not into the System or Installation folder).
16. Eject the OS X Install ESD volume.
17. You’ll likely want to re-hide invisible files in the Finder. Open the Terminal app, type (or copy and paste) the following command, and then press Return:

You now have a bootable Yosemite install drive. If you like, you can rename the drive from OS X Base System to something more descriptive, such as Yosemite Installer.

Option 3: Use Terminal

Install Yosemite Dmg From Usb Download

If you're a Terminal jockey, you likely know that most of Disk Utility's features can be accessed using shell commands—which means that you can perform the Disk Utility procedure using a few commands in Terminal.

1. Download the Yosemite installer from the Mac App Store and make sure it’s in your main Applications folder (/Applications)—it’s called Install OS X Yosemite.app.
2. Connect to your Mac a properly formatted 8GB (or larger) drive. Rename the drive to Untitled. (The Terminal commands I provide here assume the drive is named Untitled.)
3. Open Terminal and type (or copy and paste) the following commands, one by one, pressing return after each to run it. Make sure each command finishes—in other words, you see a command prompt—before running the next command. Enter your admin-level account password when prompted. (During this step, you’ll be prompted to confirm that you want to erase the contents of Untitled. Type y and press Return.)

You now have a bootable Yosemite install drive. If you like, you can rename the drive from its default name of OS X Base System to something more descriptive, such as Yosemite Installer.

Booting from the installer drive

Whichever of the above processes you've used, you can now boot any Yosemite-compatible Mac from the resulting drive: Just connect the drive to your Mac and either (if your Mac is already booted into OS X) choose the install drive in the Startup Disk pane of System Preferences or (if your Mac is currently shut down) hold down the Option key at startup and choose the install drive when OS X’s Startup Manager appears.

When your Mac is booted from your installer drive, you can, of course, install the OS, but you can also use any of the OS X installer’s special recovery and restore features. Depending on how you made your installer drive, when you boot from that drive, you may even see the same OS X Utilities screen you get when you boot into OS X Recovery (recovery mode). However, unlike with recovery mode, your bootable installer includes the entire installer.
Thanks to http://www.macworld.com/article/2367748/how-to-make-a-bootable-os-x-10-10-yosemite-install-drive.html for an awesome guide!

Want to learn how to create a bootable USB installer for OS X Yosemite?. Here is the complete step by step guide which you can follow on your MAC create the bootable USB disc. We all know that Yosemite OS X is the latest operating system form Apple, which comes with lots of new features and improvement. If you are interested in new OS and want to try it then sign up for the OS X Beta Program here, which will allow them to test the new OS, if selected.

Install Yosemite Dmg From Usb Flash Drive

Once you have the installation app for Yosemite (Install OS X 10.10 Developer Preview), don’t install it directly, other wise you will lose the file and can’t make the USB disc. To get started all you nee a *GB or above USB drive, Apple computer with Mac App Store (10.6.8+) and OS X Yosemite installer.

Create OS X Yosemite Bootable USB Drive

Step 1. Insert the USB drive or Disc on youir MAC and run the Disk Utility app from the Applications > Utilities folder.

Step 2. Now in the app select the USB drive and Selct the Partition Tab.

Step 3. Under Partition Layout, select 1 Partition from the drop-down menu. And enter the Partition information Name: ”yosemite”, Format: “Mac OS Extended (Journaled)”.

Step 4. Click the Options... button and Select GUID Partition Table. After that hit the “Ok” button then “Partition” button.

Step 5. Now the partition process will start and this will take some time to format and making USB drive as a 1 partition

Now the USB part is over and lets move to the OS X Yosemite installer package.

Step 6. Go to Applications again and find the Install OS X 10.10 Developer Preview app that you downloaded.

Step 7. Right-click the installer and select Show Package Contents from the context menu. See the Screenshot below:-

Install Yosemite Dmg From Usb Drive

Step 8. Now navigate to Contents -> SharedSupport and open InstallESD.dmg

Step 9. This will start the verify process on your MAC. Wait for some time…….

Step 10. Once the verify process is done you will see the Package Folder.

Step 11. Don’t do anything with this Packages folder just yet. First, we need to unhide the files located in this newly mounted OS X Install ESD image.

Step 12. Launch Terminal.app to enter a command to unhide the file and folder on your MAC.

Step 13. Enter the below mention two commands one by one:-

defaults write com.apple.finder AppleShowAllFiles TRUE

killall Finder

Step 14. Now you will see three more files next to the Package folder (Step 10)

Step 15. Switch back to Disk Utility.app to select the partition name created in step 3.

Step 16. Now drag the partition from the device list to the Destination box. Also, drag the BaseSystem.dmg to the Source path
Hit the Restore button.

Step 17. Now a new popup screen appears. From here click on Erase to start the restore process, then enter in your admin password and hit OK to proceed.

Step 18. Once the restore process is done, you will see a new window son your screen. Like the screen below:-

Step 19. Here, open the “System” > “Installation” folders and move the Packages file to trash.

Step 20. Now copy the Packages folder from Step 10 and paste it into the Installation folder that you just opened in previous step.

Step 21. Now Hide the system files again using this command on terminal window

defaults write com.apple.finder AppleShowAllFiles NO

That’s it!. To perform a clean install on your MAC, simply insert the USB drive that you created, power on the computer, and hold down the [option] key to access the boot selection menu. From there, select the USB drive partition, and follow the prompts to install OSX 10.10 on your Mac.