Start a computer without any internal hard drive?

boothard drive

Top result from google landed into a yahoo post. In the answer the poster is saying I can with LiveCD. But the post is about 5 years old and that's like a decade in technology world. So I'm asking again can I start (remind you only start not want to work) a computer without any hard drive?

Also I want to ask can I start a computer with an external hard drive that works like LiveCD?

Best Answer

The very first IBM PCs would start a BASIC interpreter in ROM if no hard drives, floppies, or other boot media was present. If you had a hard drive in your system, seeing this would scare you, as it could mean your hard drive failed.

When non-IBM companies cloned the PC (Compaq was the first to do that, I believe), rather than include a clone of BASIC ROM, their BIOS would merely display the message "Missing Operating System" - which is what you will see if you power on your system and no bootable device is found.

A few computers had DOS in ROM and would start that (e.g. the Tandy 1000TL) if nothing else was bootable.

To this day, if no hard drives are connected and nothing like a USB drive is connected, and there isn't a bootable CD in the CD drive, you'll see the typical manufacturer logo, and then a "Missing Operating System" or "No Bootable Device Found, Press {something} to enter setup", etc. It's still like this now.

Also I want to ask can I start a computer with an external hard drive that works like LiveCD?

You should. When you install a live distro to a USB drive you are doing just that. No reason why you can't use an external drive in place of it during the install process. As with booting via USB you may need to bring up the BIOS boot menu to select the drive instead of what it tries to boot off of from default.