Whilst looking online I found this. Not my work but though I would post it to help you.
It's so sad that SMART is so poorly understood; I think SMART tells alot about the drive and is the best drive diagnostic available. Sadly, few people know how to interpret the SMART data, and programs that try to interpret for the user do a poor job at it.
Realloacted Sector Count = INVISIBLE bad sectors that have been swapped with reserve sectors. These sectors are NO LONGER VISIBLE to your operating system and as such can NEVER cause any more problems.
Current Pending Sector = ACTIVE VISIBLE bad sectors that CANNOT BE READ but are still visible to the operating system. These are VERY DANGEROUS and cause ALOT of problems!
However, the value 200 you're seeing is a normalized value where the higher = better. You have to look at the RAW VALUE instead! For example, a raw value of 0 reallocated sectors might be the equivalent of a 200 normalized value. If the normalized value drops below the THRESHOLD value, that SMART attribute counts as a FAILURE. So if the normalized value is 200 and the threshold value is 100, that would be perfect, while the normalized value being 98 and the threshold being 100 would mean that attribute signals a FAILURE.
My advice: do not look at the normalized values at all. Only look at the RAW values!
Important SMART attributes:
- Reallocated Sector Count = bad sectors in the past; this might have caused problems in the past but does not have to; drives replace weak sectors as a precaution which may never have caused any problems.
- Current Pending Sector = THE MOST DANGEROUS smart attribute; this should ALWAYS BE ZERO or you have severe problems! This can be either weak electric charge with insufficient ECC correction ability -OR- it can be physical damage. Writing to this sector will solve the problem; if there was physical damage it will be realloacted by a reserve sector and the Reallocated Sector Count raw value will increase.
- UDMA CRC Error Count = cabling errors; if this is higher than 1000 and increasing you have severe cabling problems; under 100 does not need to trigger any alarm. Technically this means the receiving end did receive a corrupted version of the data that was sent by the transmitter; the corruption was detected by CRC which means the data is NOT accepted and the request will be sent again. Unless you see very high values or it keeps increasing steadily, this usually is not a big issue.
As you have a raw value of one on the current pending sectors count you have issues. The drive needs replacing.
Hope this helps
EDIT - Just for the record I found this here. Reallocated sector count: How important is this, really? - Ars Technica OpenForum
. Don't want to be accused of plagiarism.