So the laptop came with 8.1 and since 8.1 installer natively supports usb 3 during install I have no issue using a flash drive becasue it works with the usb 3 drivers and the laptop only has all usb 3 ports not even a single 2.0 port!! So since I want Windows 7 on it and Windows 7 installer doesn't natively support usb 3 drivers unless you integrate them into iso
Mate, i will tell you a secret that many peoples are not aware of. You can simply use either "Windows 8" or "Windows 8.1" install media (either USB or DVD ) to install "Windows 7" !. Yes, "Windows 8.1" installer officially supports installing all NT6 family operating systems including "Windows 7" , "Server 2008" and "Server 2008 R2" - only exception is Windows Vista ( If you don't know, "Windows 7" installer can install Vista too).
If you want to create a "Windows 7 x64" install USB flash drive which supports USB 3.0 and UEFI, simply follow the below steps.
1. Create a "Windows 8.1 x64" install USB with FAT32 as file system (using DISKPART ). The edition of "Windows 8 doesn't matter - you can use either a "Pro" , "Core" or "Enterprise Trial" install DVD as source.
http://www.sevenforums.com/tutorials/2432-usb-windows-7-installation-key-drive-create.html
(Steps are same for both 7 and 8 ).
2. Open the USB flash drive and navigate to the "Sources" folder. Now delete "Install.wim/Install.ESD" and "EI.CFG" files.
3. Copy your customized "Windows 7" install image ( Install.wim") to the "Sources" folder. Then open notepad and copy the below text exactly and save it as "EI.CFG" file to the "Sources" folder.
Code:
[EditionID]
[Channel]
Retail
[VL]
0
Now you got a "Windows 7 x64" install media which supports USB 3.0. Let me know whether it helps you.