[Grml] HD write protected and grml rescue mode

Hi,

I get HD write protected warning when launching testdisk. As the aftermath, testdisk can't update the MBR:

write_mbr_i386: starting... Store new MBR code file_nopwrite(4,1,buffer,0(0/0/1)) write refused write_all_log_i386: starting... write_all_log_i386: CHS: 9436/0/1,lba=151589340 file_nopwrite(4,1,buffer,151589340(9436/0/1)) write refused

I never have such hard disk being write protected warning/error before. How can I fix it? Is it because of I'm running grml in rescue mode?

Thanks