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Forum Discussion
CRC and MD5 inconsistencies
I just bought a new ReadyNAS a couple weeks ago (ReadyNAS Ultra 4 with 4x Western Digital Red 2TB drives) and finally got everything up and running, but while verifying that the data I had copied onto it matched the source copies I started to notice some differences while comparing the CRCs. Upon repeatedly re-verifying without modifying any files, the CRC would eventually match.
I thought this was probably a network issue, but to be extra certain I enabled SSH just so I could run md5sum directly on the NAS. I've now ruled out the possibility of a network issue, because when I calculate the md5sum of one of these "problem files" I am not getting a consistent result.
jday@echo:/JoshShare/_Photos/Photos Australia/2011-11-14 - Hang Gliding at Coronet Peak/JOSH$ md5sum ./SDC13926.MP4
11bdf2ff756ed004f901521d88b6adb8 ./SDC13926.MP4
jday@echo:/JoshShare/_Photos/Photos Australia/2011-11-14 - Hang Gliding at Coronet Peak/JOSH$ md5sum ./SDC13926.MP4
11bdf2ff756ed004f901521d88b6adb8 ./SDC13926.MP4
jday@echo:/JoshShare/_Photos/Photos Australia/2011-11-14 - Hang Gliding at Coronet Peak/JOSH$ md5sum ./SDC13926.MP4
11bdf2ff756ed004f901521d88b6adb8 ./SDC13926.MP4
jday@echo:/JoshShare/_Photos/Photos Australia/2011-11-14 - Hang Gliding at Coronet Peak/JOSH$ md5sum ./SDC13926.MP4
11bdf2ff756ed004f901521d88b6adb8 ./SDC13926.MP4
jday@echo:/JoshShare/_Photos/Photos Australia/2011-11-14 - Hang Gliding at Coronet Peak/JOSH$ md5sum ./SDC13926.MP4
751f5ab53c1ac84901b3cec6c8a66d4c ./SDC13926.MP4
jday@echo:/JoshShare/_Photos/Photos Australia/2011-11-14 - Hang Gliding at Coronet Peak/JOSH$ md5sum ./SDC13926.MP4
11bdf2ff756ed004f901521d88b6adb8 ./SDC13926.MP4
What could be the issue here? Bad RAM? Or perhaps a bad hard drive, but I don't notice anything worrisome in the SMART info.
I thought this was probably a network issue, but to be extra certain I enabled SSH just so I could run md5sum directly on the NAS. I've now ruled out the possibility of a network issue, because when I calculate the md5sum of one of these "problem files" I am not getting a consistent result.
jday@echo:/JoshShare/_Photos/Photos Australia/2011-11-14 - Hang Gliding at Coronet Peak/JOSH$ md5sum ./SDC13926.MP4
11bdf2ff756ed004f901521d88b6adb8 ./SDC13926.MP4
jday@echo:/JoshShare/_Photos/Photos Australia/2011-11-14 - Hang Gliding at Coronet Peak/JOSH$ md5sum ./SDC13926.MP4
11bdf2ff756ed004f901521d88b6adb8 ./SDC13926.MP4
jday@echo:/JoshShare/_Photos/Photos Australia/2011-11-14 - Hang Gliding at Coronet Peak/JOSH$ md5sum ./SDC13926.MP4
11bdf2ff756ed004f901521d88b6adb8 ./SDC13926.MP4
jday@echo:/JoshShare/_Photos/Photos Australia/2011-11-14 - Hang Gliding at Coronet Peak/JOSH$ md5sum ./SDC13926.MP4
11bdf2ff756ed004f901521d88b6adb8 ./SDC13926.MP4
jday@echo:/JoshShare/_Photos/Photos Australia/2011-11-14 - Hang Gliding at Coronet Peak/JOSH$ md5sum ./SDC13926.MP4
751f5ab53c1ac84901b3cec6c8a66d4c ./SDC13926.MP4
jday@echo:/JoshShare/_Photos/Photos Australia/2011-11-14 - Hang Gliding at Coronet Peak/JOSH$ md5sum ./SDC13926.MP4
11bdf2ff756ed004f901521d88b6adb8 ./SDC13926.MP4
What could be the issue here? Bad RAM? Or perhaps a bad hard drive, but I don't notice anything worrisome in the SMART info.
2 Replies
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- How close together are these results? Minutes?
Most of the time, RAM. If it later returns the original value, the disks probably still have the right data. - I ran a memory test and it didn't report any errors. But something is wrong with the ReadyNAS itself -- I took out all 4 hard drives and put a different one in and did a factory default and continued to get this issue.
Seems like Netgear's quality control is lacking since they shipped out a device which immediately upon purchase couldn't be trusted to do its primary function of reading the data that is stored on it. Netgear has issued an RMA but they've informed me the replacement will most likely be refurbished. Which is not surprising for a warranty replacement -- but it's not like I started with a working device that died after some period of use. When the manufacturer made the mistake of shipping a brand new item with a defect that compromises the purpose of the entire device, they should make an effort to ensure their new customer is satisfied with their purchase.
My first 4 weeks of ownership have not been a pleasant experience, and I will never be running the brand new working unit that Netgear's quality control should have ensured I got in the first place? No thanks, if that is how it is going to be then this was my first and final ReadyNAS purchase.
edit: After following up with them a couple times, Netgear's customer care has offered to correct this issue by replacing with a new ReadyNAS and waiving the fees for an expedited replacement.
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