#Ssd shows wrong capacity Pc
#Ssd shows wrong capacity series

As with the 335 Series, the SMART dataвЂ™s declining life indicator foretold the driveвЂ™s death and triggered messages warning that the end was nigh. The reaper came for the Kingston HyperX 3K next. Data was accessible until a reboot prompted the drive to swallow its virtual cyanide pill. Despite suffering just one reallocated sector, our sample dutifully followed the script.

#Ssd shows wrong capacity series

Intel doesnвЂ™t have confidence in the drive at that point, so the 335 Series is designed to shift into read-only mode and then to brick itself when the power is cycled.

The driveвЂ™s media wear indicator ran out shortly after 700TB, signaling that the NANDвЂ™s write tolerance had been exceeded. IntelвЂ™s 335 Series failed much earlier, though to be fair, it pulled the trigger itself. In any case, the final blow was fatal our attempts to recover data from the drive failed.ДЇew expected a TLC SSD to last that long-and fewer still would have bet on it outlasting two MLC-based drives. The drive may have been brought down by a sudden surge of flash failures too severe to counteract. Although the 840 Series had retired thousands of flash blocks up until that point, the SMART attributes suggested plenty of reserves remained. But it suffered another spate of uncorrectable errors on the way to 900TB, and it died without warning before reaching a petabyte.

Uncorrectable errors can compromise data integrity and system stability, so we recommend taking drives out of service the moment they appear.ДЄfter receiving a black mark on its permanent record, the 840 Series sailed smoothly up to 800TB. The drive went on to pass that test and continue writing, but it recorded a rash of uncorrectable errors around the same time. The 840 Series didnвЂ™t encounter actual problems until 300TB, when it failed a hash check during the setup for an unpowered data retention test. As the only TLC candidate in the bunch, this drive was expected to show the first cracks. Even 100TB is far more endurance than the typical consumer needs.Д¬lear evidence of flash wear appeared after 200TB of writes, when the Samsung 840 Series started logging reallocated sectors.

#Ssd shows wrong capacity Pc

Most PC users, myself included, write no more than a few terabytes per year. Delivering on the manufacturer-guaranteed write tolerance wouldnвЂ™t normally be cause for celebration, but the scale makes this achievement important. All of the drives surpassed their official endurance specifications by writing hundreds of terabytes without issue. Three-bit TLC NAND differentiates between more values within the cellвЂ™s possible voltage range, making it more sensitive to electron build-up than two-bit MLC NAND. This accumulation of stray electrons eventually compromises the cellвЂ™s ability to retain data reliably-and to access it quickly. A process called tunneling is used to move electrons in and out of the cells, but the back-and-forth traffic erodes the physical structure of the cell, leading to breaches that can render it useless.Д®lectrons also get stuck in the cell wall, where their associated negative charges complicate the process of reading and writing data. This breed of non-volatile storage retains data by trapping electrons inside of nanoscale memory cells. Our solid-state death march was designed to test the limited write tolerance inherent to all NAND flash memory. WeвЂ™ll only indulge a quick run-down of the details here. If youвЂ™re unfamiliar with the experiment, this introductory article provides a comprehensive look at our test systems and methods. ItвЂ™s time to honor the dead and reflect on what weвЂ™ve learned from all the carnage.Д«efore we get to the end, we have to start at the beginning. The last two survivors met their doom on the road to 2.5PB, joining four fallen comrades who expired earlier. Today, that story draws to a close with the final chapter in the SSD Endurance Experiment. To make matters worse, I exploited their suffering by chronicling the entire process online. Instead of offering a quick and painless death, I slowly squeezed out every last drop of life with a relentless stream of writes far more demanding than anything the SSDs would face in a typical PC. Technically, IвЂ™m also a torturer-or at least an enhanced interrogator. I didnвЂ™t do so in the name of god or country or even self-defense, either. More than 18 months ago, I vowed to push all six drives to their bitter ends. You see, these were not crimes of passion or rage, nor were they products of accident. Yet here I am, with the blood of six SSDs on my hands, and thatвЂ™s not even the half of it. I never thought this whole tech journalism gig would turn me into a mass murderer.