300TBW and Counting...

As the disk reaches 300TB written, twice its rated endurance, it's time to check on its health again by looking at its SMART stats:

ID# ATTRIBUTE_NAME          VALUE WORST THRESH TYPE      RAW_VALUE
  5 Reallocated_Sector_Ct   100   100   010    Pre-fail  0
  9 Power_On_Hours          099   099   000    Old_age   1004
 12 Power_Cycle_Count       099   099   000    Old_age   158
177 Wear_Leveling_Count     095   095   000    Pre-fail  276
179 Used_Rsvd_Blk_Cnt_Tot   100   100   010    Pre-fail  0
181 Program_Fail_Cnt_Total  100   100   010    Old_age   0
182 Erase_Fail_Count_Total  100   100   010    Old_age   0
183 Runtime_Bad_Block       100   100   010    Pre-fail  0
187 Reported_Uncorrect      100   100   000    Old_age   0
190 Airflow_Temperature_Cel 068   060   000    Old_age   32
195 Hardware_ECC_Recovered  200   200   000    Old_age   0
199 UDMA_CRC_Error_Count    100   100   000    Old_age   0
235 Unknown_Attribute       099   099   000    Old_age   26
241 Total_LBAs_Written      099   099   000    Old_age   587851297888

The first thing to say is that, despite the fact that we have written so much data already, the wear levelling count indicates that we still have 95% life remaining in the disk. And this must be because write amplification for sequential writes is so low - at just over 1x - meaning we are making incredibly efficient use of the disk. The rest of the stats tell a similar story of good health: not a single error reported of any kind so far.

This also seems like a good point to move on to the second stage of testing. We will secure-erase the disk and then reformat it without any additional over-provisioning this time, continuing to repeatedly fill it with a single large file.