I have a pretty old Ubuntu 8.04 machine. The machine doesn't have a DVD reader/writer in it. Challenge: Now, the challenge I am facing is to install RHEL6 in this machine. Obstacle 1: I needed to make a boot image from USB disk so that I can use it to install the RHEL6 in this machine. I was able to overcome the obstacle 1 successfully by following the below approach. I used the iso2usb software and used an existing image of RHEL6 to have a bootable USB disk for installation. It worked perfectly fine in another machine when I tried booting from USB and installing. Obstacle 2: Now, when I use this same USB in the server machine, it gives me the first screen where I can select to install the RHEL6. After selecting to install the RHEL6,  it gives me an error as,Unable to find any devices of the type needed for this installation  type. Would you like to manually select your driver or use a driver  disk?I am stumped at this obstacle and tried various options to overcome this. I tried using an USB drive with lesser storage (4 GB) since I guessed using larger USB storage (earlier I used 16 GB ) sometimes might not work well with the ancient hardware. I also tried the option specified here. When the bootloader screen appears,I added,linux all-generic-ide irqpoll pci=nommconfI also tried using various USB ports. The USB is getting recognized but again gives the same error as above. Now the only option left to try is to hook up a DVD drive to this machine and try the installation. However, I just want to know if am missing out any other option. Also, is it possible that the installation is failing because of the hardware in the machine? I am not sure if the driver update for the USB drives might fix the problem. 
Installation from USB fails
rhel;system installation;usb drive