Can I treat my 128 GB USB like the internal hard disk drive (HDD) and make an Ubuntu OS installation on it and whenever I want, boot the OS from it, and be as fast as using the original OS with a HDD?
My USB is the new fast 3.0.
Can I treat my 128 GB USB like the internal hard disk drive (HDD) and make an Ubuntu OS installation on it and whenever I want, boot the OS from it, and be as fast as using the original OS with a HDD?
My USB is the new fast 3.0.
Yes, you can. Here you will find comprehensive instructions on how to do it:
How to install Ubuntu on an USB stick
But the performance will not be the same as if you install it on a HDD or SSD.
Theoretically, it should work with a persistent USB.
While creating the USB startup disk from an Ubuntu ISO file, make sure you select the option "Stored in reserved extra space" for storage of documents and settings. You should allocate a good amount of space to this heading if you are going to use Ubuntu from your USB for a long time.
Once the startup disk has been created, plug it into the computer you want to use it on, boot from it and select try ubuntu to use Ubuntu direct from your USB without having to install it.