Satellite L770D-10J doesnt boot - Disk Read Error

My Laptop can't boot and it gives me the error Message:
An Disk read error as occured, press ctrl+ alt + del.
I did it a couple times and i tried to fix that problem because i have no Win7 DVD to boot from, i tried to reset the BIOS to its standart options, and now it wants a Passwort from me.
I didnt even enter one so i wont know it.
After 3 tries the System shuts down and i have to re-start my Computer.
Now i have an extern harddrive but i cant try to boot from it because my Laptop wants that Passwort.
To enter BIOS or Menue i also need this passwort.
I really need help, if you know anything please contact me with "TOSHIBA LAPTOP SUPPORT". My garantee ran out already.
Sorry for that bad english, its not my native language.
Thank you for helping me.

I guess you are talking about the BIOS password.
This BIOS password can be deleted by authorized service provider available in your country.
I have no idea why an BIOS password appears if you did not set it in the past, but fact is that unknown password cannot be deleted by common notebook user. The BIOS password is an very important security feature and only authorized persons are able to delete it.
Here also the information from Toshiba:
Regarding the disk read error:
Im not quite sure what disk do you mean exactly but in case the installed system cannot boot up, I think that HDD is faulty and needs to be replaced. After such replacement you would need to install the system again. The easiest way to install the system is the usage of Toshiba recovery disk because all Toshiba tools and drivers would be installed together with the Windows system.

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