My máy tính xách tay has recently started to lớn become a bit unreliable, & for some reason I started khổng lồ suspect that my HDD was starting to lớn fail. After a bit of hunting on the internet, I found Ubuntu"s Disk Utility in the System menu và ran the long SMART diagnostics from this.

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However, since the documentation for Disk Utility is very poor (palimpsest?), I"m not sure how khổng lồ interpret the results:


For example, the Read Error Rate is over 50 million (!), yet the Assessment is rated "Good".

So would someone mind explaining lớn me how to lớn interpret the results of these tests (especially the Normalized, Worst, Threshold và Value numbers)? và maybe tell me what they think of the results I got for my HDD? (Thanks)

hard-drive smart mô tả Improve this question Follow asked Jan 6 "11 at 23:46

MartyMarty 1,85533 gold badges1717 silver badges1515 bronze badges 2 showroom a bình luận |

3 Answers 3

Active Oldest Votes 65 You have a good description of how SMART works on wikipedia. But a quick intro:

Value: This is the raw value that the controller reports. Usually it"s an easy lớn understand value (like power on hours or temperature), but sometimes it isn"t (like the read error rate). Different manufacturers can use different structures và meanings for this data.

Normalized: This is the above value normalized so a higher value is always better. So a 114 in read/error rates is better than 113. Again, how your hard drive converts raw data to normalized value is vendor specific.

Worst: The worst normalized value that your drive had in the past (where 99 is likely the factory setting).

Threshold: When the normalized value is lower than this value the drive is likely to lớn fail.

So, your hard disk seem khổng lồ be ok. The value of the read error rate is not the times that your drive failed, but some data struct that depends on your disk manufacturer.

chia sẻ Improve this answer Follow edited Nov 3 "16 at 8:42

muzzamo 22311 gold badge22 silver badges66 bronze badges answered Jan 7 "11 at 8:38

Javier RiveraJavier Rivera 33.6k99 gold badges8585 silver badges108108 bronze badges 1 địa chỉ a bình luận | 27 Yes, generally the raw value for read error rate is nonsense. The values you want lớn keep an eye on are the reallocated sector count, pending count, and offline uncorrectable. Those are the count of bad sectors that have been, are waiting khổng lồ be, or can not be corrected, & the raw values there generally make sense and are the count of sectors. nội dung Improve this answer Follow answered Jan 7 "11 at 15:46

psusipsusi 34.9k22 gold badges6363 silver badges100100 bronze badges 2 địa chỉ cửa hàng a comment | 11 psusi nails it.

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If you read the data sheets (white papers) say at seagate.comyou will see how HDD"s are made, tested and how they really work.There is no perfect HDD, never was, never will be, (history and fact).In the olden days, we had khổng lồ enter the bad sectors in to lớn the HDD controllerfrom a list on paper that came in the new drive box, so the controller skips them.

Modern drives have error correction. From day 1 sectors are bad.

So they map them out, this means the drive skips bad sectors.In fact they are "logically swapped out" - the bad sector is mapped to a new, good, spare cylinder sector (it has spare cylinders - think of cylinders as tracks). This is all transparent khổng lồ the outside world - except for the SMART util.

Each manufacturer can vì chưng as they please, so some mix the error counts khổng lồ zero, even though there might be 10 bad sectors as soon as the drive is manufactured.

There is a 3 times rule in the drive"s firmware - it reads a sector 3 times & if all 3 times it is bad then it may do a "recalibrate" on the fly, and read 3 more times. If the drive is still not ok it will maps that sector to one of the spare sectors. This is deep in the firmware, but happens continually in the background, all transparent khổng lồ the user.

Point 2: all HDD have natural read errors, you can learn that at Seagate too, if you want. But they all have errors on the fly. & are read again, and usually pass the kiểm tra for CRC errors. If not the DRIVE tries to swap it out.if you run the disk cool, it will last a long time & you many never run out of spare cylinders. But bởi look at that as psusi tells you !

I"m typing this , on an old PC , running one of the first 1gb HDD ever made. & is still good. (im backed up ) (no lack of cooling ever...) heat is the #1 killer và power surges, I run a UPS. Cheers và good day. I hope this helps. (ever seen a DatA General hard disk crash? & fill the room with vast amounts of aluminum wool, curly cues? lots of fun back then... Never a dull moment....

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