To keep my systems working at top speed, I do not store any data on my main drives, only software. Data I store on a separate drive and its copy drive. The computer only handles the data for the specific project I am working on and then it is removed and stored on the data storage drive. And as a matter of maintenence I like to reinstall my operating system and software periodically. As a matter of emergency I understand there is a way to download the recovery disk assistant in advance of a disaster on to a flash drive and boot up a dead system and reinstall the OS from the flash drive on which the operating system is stored. I understand that the versions of my OSX consume more than 4GB and so I was planning to purchase 1 8GB flash drive for each system. It is rumored that some flash drives are bootable or that you can make them bootable somehow. That is my question: what kind of flash drive do you buy and/or how do you do it? Flash drive companies are being non-commital and will not tell me anything. Yet I remain under the impression that IT guys do indeed exist who go around with bootable flash drives to start up people's computers and I want to provide for myself this convenience. Do you know how this is done?
There are many guides online detailing how to create an OS X installation USB flash drive.
It involves copying a .dmg from the Install OS X App and 'restoring' it to the flash drive with Disk Utility. I can't remember all of the steps but I've done it before. The flash drive was bootable.
I would suspect that most if not all modern flash drives would boot OS X.
I believe that the OS X installer contains the utilities/capabilities of the Recovery Partition.
You do need 8GB flash drive at least.
I think you meant to say "gigabyte' instead of MB but...
How to make your own bootable OS X 10.9 Mavericks USB install drive
Flash if fine for installers, for the system I would stick to partitioned hard drive(s), probably with USB3 easy to add PCIe Allegro to Mac Pro model and others should hopeful, or look for Thunderbolt + USB3.