im having a different Error shown by the S.M.A.R.T report.
Model: MAXTOR STM3160215AS
Firmware: 4.AAB
Serial: 6RA7A2LN
LBA: 312581808
(2MB cache)
001 Raw Read Error Rate 100 253 00000000-0000 006
003 Spin Up Time 097 097 00000000-0000 000
004 Start/Stop Count 096 096 00000000-136A 020
005 Reallocation Sector Count 100 100 00000000-0000 036
007 Seek Error Rate 084 060 00000FE2-D208 030
009 PowerOn Hours Count 094 094 00000000-16F0 000
010 Spin Retry Count 100 100 00000000-0000 097
012 Device Power Cycle Count 096 096 00000000-1366 020
187 Reported Uncorrectable Error 100 100 00000000-0000 000
189 High Fly Writes 100 100 00000000-0000 000
190 Airflow Temperature 065 052 35 C 045
194 HDA Temperature 035 048 35 C 000
195 Hardware ECC Recovered 070 062 00000000-452B 000
197 Current Pending Sector Count 100 100 00000000-0000 000
198 Uncorrectable Sector Count 100 100 00000000-0000 000
199 UltraDMA CRC Error Count 200 200 00000000-0001 000 200 Write Error Rate 100 253 00000000-0000 000
202 Data Address Mark Errors 100 253 00000000-0000 000
im not sure whether this "UltraDMA CRC Error" is the main cause of Very Slow file Copy speed in windows 7. Copy starts at 40-50MB/sec then falls back to 20-15mb/sec.

c: 26.3 free space 4.17GB
D:122 free space18.5GB
I have already switched the sata cable from my DVD burner but that didn't help.
So if this error is from faulty cable ....then replacing the cable SHOULD put the "UltraDMA CRC Error Count" to 0 ......????? do i sound right?
eagerly waiting for your response.