Two Petabytes Written - Time for a Short Break

So, the 850 Pro continues to impress, and this is quite something: 2PBW and the flash is less than a third worn. According to SMART stats, we should still have another 4+PB (69%) to go:

ID# ATTRIBUTE_NAME          VALUE WORST THRESH TYPE      RAW_VALUE
  5 Reallocated_Sector_Ct   099   099   010    Pre-fail  7
  9 Power_On_Hours          099   099   000    Old_age   2507
 12 Power_Cycle_Count       099   099   000    Old_age   167
177 Wear_Leveling_Count     069   069   000    Pre-fail  1867
179 Used_Rsvd_Blk_Cnt_Tot   099   099   010    Pre-fail  7
181 Program_Fail_Cnt_Total  100   100   010    Old_age   0
182 Erase_Fail_Count_Total  099   099   010    Old_age   7
183 Runtime_Bad_Block       099   099   010    Pre-fail  7
187 Reported_Uncorrect      100   100   000    Old_age   0
190 Airflow_Temperature_Cel 064   060   000    Old_age   36
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   30
241 Total_LBAs_Written      098   098   000    Old_age   3906798501645

We're going to take the opportunity to test the flash's retention by powering off the system for a week, and then checking that we can read back a large data file filling the disk. If this is ok, we'll restart the testing and let it run for another 2 PB.