Sudo command and root user Problems.

Hi all,
I am new to macs but am fairly good with windows computers. In the terminal on my mac if i type in any command with sudo on the front i get a:
Whats more i also cannot log into the root user of my mac i just get a wrong password error. I know its the right password and i have tried to change it but it doesn't work!
Please help me!
Thanks in advance
Ed

yes, it was nailed for gutbunny, but this did not nail it for me. situation: new 32 GB USB flash drive that was allowed to go to sleep with mac book pro 15" 2.33 using mac os 10.4.11. it woke up with no permissions to write to owner or admin user or root. did the following:
GeoG5-2:/Volumes/DiskGO george$ sudo chflags nouchg .
chflags: .: Read-only file system
chflags: .: Read-only file system
GeoG5-2:/Volumes/DiskGO george$ pwd
/Volumes/DiskGO
GeoG5-2:/Volumes/DiskGO george$ ls -l
total 128
drwxrwxrwx 1 george george 16384 Feb 14 21:43 !DrawingLT
drwxrwxrwx 1 george george 16384 Feb 14 19:14 !TeachingLT
drwxrwxrwx 1 george george 16384 Jan 19 08:54 !Words(new)
drwxrwxrwx 1 george george 16384 Feb 15 08:26 DiskGO stuff
short answer is that neither admin george nor root can unlock this thumb drive. and i've tried this with lock/unlock in both positions. should i send it back to the mfgr for replacement?
thanks
george

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yes, it was nailed for gutbunny, but this did not nail it for me. situation: new 32 GB USB flash drive that was allowed to go to sleep with mac book pro 15" 2.33 using mac os 10.4.11. it woke up with no permissions to write to owner or admin user or root. did the following:
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thanks
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