WD20EARS Bad SMART status = BAD Problem

WDC WD20EARS-00MVWB0 WD-WMA
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  ID Name Value Worst Tresh Raw Health
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  1 Raw read error rate 45 45 51 12663 ••    
  3 Spin-up time 172 165 21 6391 ••••• 
  4 Number of spin-up times 100 100 0 427 ••••• 
  5 Reallocated sector count 169 169 140 592 ••••• 
  7 Seek error rate 200 200 0 0 ••••• 
  9 Power-on time 98 98 0 1659 ••••  
 10 Spin-up retries 100 100 0 0 ••••• 
 11 Recalibration retries 100 100 0 0 ••••• 
 12 Start/stop count 100 100 0 186 ••••• 
192 Power-off retract count 200 200 0 129 ••••• 
193 Load/unload cycle count 195 195 0 17514 ••••• 
194 HDA Temperature 109 101 0 42°C/107°F ••••  
196 Reallocated event count 1 1 0 492 •     
197 Current pending sectors 200 200 0 245 ••••• 
198 Offline scan UNC sectors 200 200 0 13 ••••• 
199 Ultra DMA CRC errors 200 200 0 0 ••••• 
200 Multi zone error rate 180 157 0 5456 •••••

 my SMART bad , disk size now 50GB

Can I replace the under guarantee?

If under warranty, yes, you should be able to replace your drive, try to contact WD Tech support at:

http://support.wdc.com/contact/index.asp?lang=en