Hellow Friends,
 I'm trying to install NetBSD on an old laptop Compaq 1220 (chip Cyrix MMX 200). No problem with the installation (of a release 1.6.1) but when the machine first start I receive the following message: 
 /dev/rdw0a: BAD SUPERBLOCK: VALUES SUPERBLOCK DISAGREE WITH THOSE IN FIRST ALTERNATE
 RUN fsck_ffs MANUALLY 
 I know the disk insn't original and was changed recently (it also isn't a new one).
 I'd like to understand what is going on. am I losing my disk?
 Any help is welcome. Thanks in advance.
 Paulo