All your listed HDDs are in good working condition. Not all SMART data are important to the actual health of your HDD. Most of them are informational, like the "Power On Hours Count". "Reallocated Sector Count" and "Current Pending Sector" are something to look out for, but only if the values are increasing over a short period or the value is large. I don't know why your "Spin Retry Count" is highlighted as a warning.

It can be hard to interpret the raw data shown. My Samsung 1TB's "Spin Retry Count" has a Current and Worst value of 252 and a Threshold of 51, unlike your 100 and 97. I haven't looked deeply into the meaning of the SMART attributes.

My almost 1 year WD Green 1TB just dead.. waiting warranty.

bad luck 

luckily still able boot up to partial data from it before completely dead...

Reliability of WD Green sucks to the max.

current and worst what is that worst
and what threshold
1tb threshold 6 if high number like 50 or 100 will be bad
0 mean very good ah

Reliability of WD Green sucks to the max.

My RMA-ed 500gb WD Green just returned back to me. They replace me with a completely new 800gb WD Green HDD.

WD's 808GB HDDs are not new, it has been a few years already, and are created from scavenged defective platters and targeted at Chinese customers, hence the unusual use of the 8s. That said, I have no idea if they are less reliable or not.

I have no choice, they return me this drive.

Both of my WD Green 1TBs have passed their third year of life. *touch wood*
Interpreting the data is difficult, especially as it doesn't seem to adhere to a single standard. This is why I don't read too deeply into the SMART data and so I haven't learned it. If you wish to learn, you'll have to look from other sources. Furthermore, a Google white-paper (linked on the first post of the topic) suggests that SMART data does not adequately predict impending HDD failures, making it less useful to learn.

quick qestion:
i just drop my 1TB external HD and when i connect it to USB, it say my HD is not format.. any pro know how to solve this?? to much data on that HD.. dont want to lose it T_T

It's not all bad. The platters might be scavenged, but it could still last you 3 years so you've gained 300GB for free. 

There are several HDD testing tools listed on the first post of this topic which you could try. If in doubt, use the HDDScan 3.3.

i just tested.. and it say
UltraDMA CRC Errors  so, how do i fix this???

I strongly recommend taking your external HDD to your local shop or trusted expert for testing and advice. They might need to extract the HDD from the casing to test it with another external device or directly plug it in to a computer to see if the HDD is still working or not. Please do not use or power on the external until they have examined it.