So I took the drive out of the NAS and hooked it up through USB using a HD Quickport. I used HDDscan to check for surface errors, which came back with this report:

But I can't tell whether this is good or bad. I also ran the SMART test which gave me these results (all items had green 'ok' icons in front, except for "UltraDMA CRC errors", which was an exclamation mark):

VALUE WORST THRESHOLD

001 Raw Read Error Rate 100 100 0000000000-0000 051

003 Spin Up Time 078 078 0000000000-1C84 011

004 Start/Stop Count 100 100 0000000000-0151 000

005 Reallocation Sector Count 100 100 0000000000-0000 010

007 Seek Error Rate 100 100 0000000000-0000 051

008 Seek time Perfomance 100 100 0000000000-274F 015

009 Power-On Hours Count 087 087 0000000000-F70F 000

010 Spin Retry Count 100 100 0000000000-0000 051

011 Recalibration Retries 100 100 0000000000-0000 000

012 Device Power Cycle Count 100 100 0000000000-00C1 000

013 Soft read error rate 100 100 0000000000-0000 000

183 SATA Downshift Error Count 100 100 0000000000-0000 000

184 End To End Error Count 100 100 0000000000-0000 099

187 Reported Uncorrectable Error 100 100 0000000000-0000 000

188 Reported Command Timeouts 100 100 0000000000-0000 000

190 Airflow Temperature 063 055 37 C 000

190 Airflow Temperature Minimum 063 055 29 C 000

190 Airflow Temperature Maximum 063 055 42 C 000

194 HDA Temperature 079 054 21 C 000

195 Hardware ECC Recovered 100 100 0000001299-9A83 000

196 Reallocation Event Count 100 100 0000000000-0000 000

197 Current Pending Errors Count 100 100 0000000000-0000 000

198 Uncorrectable Errors Count 100 100 0000000000-0000 000

/!\ 199 UltraDMA CRC Errors 100 096 0000000000-0003 000

200 Write Error Rate 100 100 0000000000-0000 000

201 Soft Read Error Rate 100 100 0000000000-0000 000

Again, I have no clue as to what I'm seeing here. Please help me make sense of these figures.

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