Satellite C855D-16V - BIOS & HDD Password - Need some information

Hi - just bought a new C855D-16V, wiped the Windows 8 OS and installed Windows 7. I see that the BIOS has options for BIOS and HDD passwords, and I would like to use one of these to secure my data.
I am looking for a detailed explanation of how they work, what effect they have, how reliable and secure they are. Does HDD password protect the disk if removed and mounted on a Linux system, for example? Is it possible to export a back-up key for emergencies? Does BIOS PW lock the HDD, or just stop the mainboard from booting? Can't find anything via google, and the "user manual" is useless.
As above, I am NOT trying to bypass or remove an existing password. I am deciding whether BIOS or HDD provides sufficient protection. I would have used Truecrypt, but it doesn't work well with backup utils like Macrium & TrueImage.
Can anyone link me to a good, detailed explanation of these options, please?
Thanks!

Hi
I found several useful Toshiba documents. Check it out and if you still have some question you are welcome.
[BIOS user password |http://aps2.toshiba-tro.de/kb0/FAQ9202JE0000R01.htm]
[BIOS supervisor password |http://aps2.toshiba-tro.de/kb0/FAQ9202JF0000R01.htm]
[What is A HDD Password?|http://aps2.toshiba-tro.de/kb0/FAQ9202JG0000R01.htm]
[Is it possible to remove a forgotten HDD password?|http://aps2.toshiba-tro.de/kb0/FAQ9401AR0000R01.htm]
[TOSHIBA HDD Password summary |http://aps2.toshiba-tro.de/kb0/TSB6B01MC000CR01.htm]

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