Then after installing PCLOS on disk, enable booting from it in BIOS and plugging and turn it on all will work out of the box without problem's right?
I want to ask a 2 question's...
1.Does e-Sata works without problem's when I have AHCI mode enabled (I mean auto mounting the drive)?
2.I want to install on it an PCLOS and make an partition for backup's (Will it work without problem's when I got option to only boot from the extrenal drive and DVD) I mean that it will work just like in normal disk after installing Grub in MBR on it?
1. It does on my machine. The external drive is treated exactly like it's an internal drive. When selected to be the boot drive, the grub installed in it's MBR gives the same boot menu as that on the internal drive, but with the boot options from it's own /boot/grub/menu.lst. In my case I've added the boot options for the installations on all drives, with whatever modifications necessary to show those as being on (hd1,n), (hd2,n), or (hd3,n), being as those will shift when the external drive becomes (hd0)
2. As stated, one needs to modify the boot options in that drives master menu.lst, to reflect each installation relative to the external drive being (hd0). This is the same as would be necessary if the drive were an internal drive, designated as the boot drive.
Essentially yes, but the devil is in the details. The drive must be connected, and turned on, before
it can be selected as the boot drive in BIOS. That means before
the computer itself is turned on. If the BIOS can't see the drive when the computer is first turned on, it will not show up in the list of bootable hard drives. If the drive is removed/not present
when the computer is turned on, the boot drive will automatically revert to one of the drives the BIOS can see. One would need to reboot, after starting the external drive, in order for it to be selectable as the boot drive, in BIOS.
As the majority of my installations are on the external drive, it is always connected, and I always power it up before the computer. In this manner it always remains as the boot drive. If I do remove the drive, to use with another machine, the main machine then boots from the default internal boot drive, and even if I reconnect the external drive, will not boot from it until I manually reset it as the boot drive. This applies only if the main machine is turned on while the external drive is not present. If the drive is used elsewhere, then returned to the main machine, and the main machine has not been turned on during the time the external drive was disconnected, as long as the external drive is powered up before the computer itself, the settings making it the boot drive will not have changed, as the computer will not have sensed the time it was not present.