How to slipstream usb 3


Recently I came across a problem when attempting to install Windows 7 onto a Dell Precision 7710. I would boot up with a DVD that had an .iso image of Windows 7 installed on it, but when after clicking the install windows button, I would get a notice that the installer couldn"t locate the CD/DVD driver and I needed to browse to locate it. Well, I thought I would be smart and instead do the install via a USB device. Same error. Well, how does this make sense? It"s asking for a DVD driver when using a USB device. That"s like your car throwing a CEL for the carburetor not working when you"re using fuel injection.

This issue is caused because the installer media doesn"t have a driver to install through a USB 3.0 port. You might ask, well why did the DVD drive throw the error? Well, that"s because the DVD drive was an external because there is no internal DVD drive on this model laptop. So I now know my problem. USB 3.0 drivers need to be added to the boot media. Follow this guide and I"ll show you how to accomplish this using the CMD line and the DISM utility.

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Now, I had all intention of describing this how-to specifically for adding USB 3.0 drivers, but it can also be used for adding any number of drivers to the boot media as well.

First thing you"re going to do is to download the USB drivers from either your computer"s manufacturer or from your motherboard"s manufacturer. With the Dell Precision 7710 I went to, punched in my service tag number and proceeded to download an entire driver pack in .CAB format.


Depending on the type of file you downloaded, it could be an .exe, a .cab, or a .zip, so you"ll need to unzip the drivers out of this file. Driver files are historically mainly .inf files, but you don"t need to pick and choose the individual files because this next process makes it automatic for you. The DISM (Deployment Image Servicing and Management Tool) is smart and will automatically grab the correct files.

1. Create a folder on your desktop named "Drivers".2. Create two folders inside of the "Drivers" folder, "mount" and "USB".3. Extract or copy/paste the driver files directly into the "USB" folder. I used 7-zip to extract my driver files directly into the "USB" folder.


Locate these two files from within your boot media. This is easy if you are using a USB drive instead of a DVD, so that you don"t have to reburn the DVD once we finish modifying these files.

Example: If the USB drive is plugged in and has been given drive letter "P:\" you will locate the "boot.wim" and "install.wim" files within the path: P:\sources

It is best to just cut them out of the install media, but if you want to have a backup copy you can copy and paste. You are pasting into the "Drivers" folder on the desktop. Just make sure to overwrite the old files with the new updated ones once we"re finished with this process.

Step 4: Open up CMD prompt as Administrator and navigate to the 'Drivers' folder on the desktop


Windows 7:1. Start, type in cmd, right click on the icon and choose Run as AdministratorWindows 8:1. Windows Key + Q2. Move mouse to top right corner and search, type in Command Prompt, Right click and Run as Administrator.

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Next, you will need to change the directory path so that it isn"t pointing to the default of C:\Windows\System32.

Type in: cd C:\Users\%currentuser%\Desktop\Drivers - Then press Enter.*Note: Make sure to change the %currentuser% to that of the user profile where the "Drivers" folder was saved.

In the cmd line now displaying the cd pointing to the right directory, type in these commands pressing enter after each one.

dism /mount-wim /wimfile:boot.wim /index:2 /mountdir:mountExplanation: This command mounts the boot.wim file, index points it to the correct boot parameters for the correct OS, and /mountdir:mount points it to mount the file to the "mount" folder we created in this directory earlier.

dism /image:mount /add-driver:"USB" /recurseExplanation: This command automatically grabs the driver files that it locates in the "USB" folder that we created earlier and copied the drivers to. This can take a while depending on the number of driver files that it locates.

dism /unmount-wim /mountdir:mount /commitExplanation: This command unmounts the boot.wim file and saves the information. Think of this as a file transfer/compression process.

Step 6: Determine which index you're going to update the driver files for on the 'install.wim' file


This process wasn"t necessary on the "boot.wim" file, but it is in the "install.wim" file. Each version of Windows can have a specific index number and we will need to locate which one it is in order to issue the command for the version of Windows you plan on installing. This is specific to the install media you are using because some install media only comes with one version of Windows 7, such as Professional, but some others may have multiple version of Windows 7, such as Home, Ultimate and Professional, just to name a few.

Issue the following command to determine what your version is:

dism /Get-WimInfo /WimFile:install.wim

You"ll see in the screenshot that I have an index of 1.

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You should still be pointed to the correct directory, so now issue the following commands to update the "install.wim" file, using the index information you got from the step above.

dism /mount-wim /wimfile:install.wim /index:1 /mountdir:mountExplanation: All exactly the same as the boot.wim file command, except the index is the only difference.

dism /image:mount /add-driver:"USB" /recurse

dism /unmount-wim /mountdir:mount /commit

Since I used the Cut/Paste method to remove these two files from the P:\sources location, I"m going to do the same to remove them from the C:\Users\%currentuser%\Desktop\Drivers folder and place them back into the P:\sources folder.

Wait for the transfer to finish. This is going to take a little bit longer to copy back over to the flash drive because the files going back in are larger than they were before due to the driver files that you"ve added to it.

Take out the flash drive and pop it into the machine you want to reinstall Windows 7 on. You should now find that you no longer receive the pesky CD/DVD driver missing notice.

Thank you all for reading through this. These commands can be adapted to suit whichever folder names you want to use. Good luck!