When I run SpeedFan, it says I have 3680 reallocated sectors while HDTune says everything is fine.
Obviously one of them is wrong.
What do you use to check S.M.A.R.T. data ?
They may both be right.
There are 3680 reallocated sectors.
Everything is 'fine' because that makes up a miniscule amount of the disk and there are still spare sectors if further reallocation is required.
If that number continues to increase, then you can start to worry.
I re-ran the test using the extended test.
It said the drive as 99% healthy.
You will (probably) get more information by using the manufacturer's testing software, because only some SMART info is common.
Western Digital use Data Lifeguard Diagnostics (windlg), Seagate use Sea Tools, Hitachi/HGST use Drive Fitness Test (windft).
I used Fujitzu's software.
It only showed PASSED with no details.
OTOH smartctl gave this. (passed)
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x002f 100 100 046 Pre-fail Always - 217586
2 Throughput_Performance 0x0025 253 253 030 Pre-fail Offline - 35061760
3 Spin_Up_Time 0x0023 100 100 025 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 099 099 000 Old_age Always - 4266
5 Reallocated_Sector_Ct 0x0033 067 064 024 Pre-fail Always - 3280 (1211 789)
7 Seek_Error_Rate 0x002f 100 100 047 Pre-fail Always - 3879
8 Seek_Time_Performance 0x0025 253 253 019 Pre-fail Offline - 0
9 Power_On_Hours 0x0032 069 069 000 Old_age Always - 15501
10 Spin_Retry_Count 0x0033 253 253 020 Pre-fail Always - 0
11 Calibration_Retry_Count 0x0032 253 253 000 Old_age Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 4092
180 Unused_Rsvd_Blk_Cnt_Tot 0x002f 100 100 098 Pre-fail Always - 0
182 Erase_Fail_Count_Total 0x0032 100 100 000 Old_age Always - 0
183 Runtime_Bad_Block 0x0032 253 253 000 Old_age Always - 0
184 End-to-End_Error 0x0033 253 253 097 Pre-fail Always - 0
185 Unknown_Attribute 0x0030 100 100 000 Old_age Offline - 7
186 Unknown_Attribute 0x0032 253 253 000 Old_age Always - 0
187 Reported_Uncorrect 0x0032 100 096 000 Old_age Always - 89339616296988
188 Command_Timeout 0x0032 100 093 000 Old_age Always - 17180131369
189 High_Fly_Writes 0x003a 100 100 000 Old_age Always - 0
190 Airflow_Temperature_Cel 0x0022 072 049 045 Old_age Always - 28 (Min/Max 20/33)
191 G-Sense_Error_Rate 0x0032 253 099 000 Old_age Always - 16580610
192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always - 11403438
193 Load_Cycle_Count 0x0032 089 089 000 Old_age Always - 229231
195 Hardware_ECC_Recovered 0x003a 253 253 000 Old_age Always - 5584
196 Reallocated_Event_Count 0x0032 067 064 000 Old_age Always - 134 (8 15968)
197 Current_Pending_Sector 0x0032 098 095 000 Old_age Always - 3
198 Offline_Uncorrectable 0x0030 253 253 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x003e 253 253 000 Old_age Always - 2