WDC WD20EARS-00MVWB0 fails quick test

I did an extended scan and here are the results:

Test Option: EXTENDED TEST

Model Number: WDC WD20EARS-00MVWB0

Unit Serial Number: WD-WCAZA1308286

Firmware Number: 51.0AB51

Capacity: 2000.40 GB

SMART Status: PASS Test

Result: FAIL Test Error Code: 08-

Test Time: 20:33:44, January 11, 2011

System Info:

XP PRO SP3 X86 32bit

MSI MS-7309

AMD Athlon II X2 240 2.81 GHz

2GB RAM

ASUS EAH5450 1GB RAM

Primary HDD: WDC WD3200AAKS-00V1A0 (SATA)

Secondary HDD: WDC WD500AAKB-00H8A0 (SATA)

External HDD: WDC WD20EARS-00MVWB0 (USB)

What should I do, back up my files from the USB external to my C: & F: and do an extended test again and click fix it after it scans even though it took over 18 hours and use the fix option? I didn’t try the fix option cos I’m using the external to back up my videos and didn’t want to risk losing any of them.

Edit

I downloaded CrystalDiskInfo and this is what it says:


 (3) WDC WD20EARS-00MVWB0

       Enclosure : WDC WD20 EARS-00MVWB0 USB Device (V=04C5, P=201D, sa1)
           Model : WDC WD20EARS-00MVWB0
        Firmware : 51.0AB51
   Serial Number : ***************
       Disk Size : 2000.3 GB (8.4/137.4/2000.3)
     Buffer Size : Unknown
     Queue Depth : 32
    # of Sectors : 3907029168
   Rotation Rate : Unknown
       Interface : USB (Serial ATA)
   Major Version : ATA8-ACS
   Minor Version : ----
   Transfer Mode : SATA/300
  Power On Hours : 646 hours
  Power On Count : 32 count
     Temparature : 40 C (104 F)
   Health Status : Caution
        Features : S.M.A.R.T., AAM, 48bit LBA, NCQ
       APM Level : ----
       AAM Level : 80FEh [OFF]

– S.M.A.R.T. --------------------------------------------------------------
ID Cur Wor Thr RawValues(6) Attribute Name
01 196 195 _51 000000000180 Read Error Rate
03 166 164 _21 000000001A13 Spin-Up Time
04 100 100 __0 000000000031 Start/Stop Count
05 200 200 140 000000000000 Reallocated Sectors Count
07 200 200 __0 000000000000 Seek Error Rate
09 100 100 __0 000000000286 Power-On Hours
0A 100 253 __0 000000000000 Spin Retry Count
0B 100 253 __0 000000000000 Recalibration Retries
0C 100 100 __0 000000000020 Power Cycle Count
C0 200 200 __0 00000000000A Power-off Retract Count
C1 200 200 __0 000000000454 Load/Unload Cycle Count
C2 110 104 __0 000000000028 Temperature
C4 200 200 __0 000000000000 Reallocation Event Count
C5 200 200 __0 000000000012 Current Pending Sector Count
C6 200 200 __0 000000000012 Uncorrectable Sector Count
C7 200 200 __0 000000000000 UltraDMA CRC Error Count
C8 200 200 __0 00000000009A Write Error Rate

It gives me a caution for C5 200 200 __0 000000000012 Current Pending Sector Count & C6 200 200 __0 000000000012 Uncorrectable Sector Count.