Adding Files to a bootable USB

Hi ...
After creating a bootable USB  using "etcher" utility from ISO files on a USB flash drive, the USB drive becomes the same size as the ISO file and cannot add more files. Moreover, inserting it into Windows OS , the usb key is not recognized anymore. Is there a better utility supporting any kind of bootable ISO files and still be useable to add more files to it.

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LinuxLive USB Creator can do just that. You can set available free MB on the USB.

David Johnson, CD, MVPRetiredCommented:
I use rufus you can then copy files to the usb afterwards

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Jason CarsonComputer TechnicianCommented:
In order for Windows to recognize it you have to format the USB stick using a filesystem windows recognizes such as fat or NTFS.

If the USB stick is formatted with ext4 for example windows won't recognize it.
noxchoProduct ManagerCommented:
Rufus is my favorite tool for bootable USB stick creation. Check via Windows Disk Management in which file system the drive gets formattef once you create it.
Duncan RoeSoftware DeveloperCommented:
I use unetbootin. I've used it to burn a number of distros, including Knoppix.
You may have a problem if your PC is enforcing secure boot - I turned that off on my system..
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