De Samsung SSD's zijn doorgaans zeer betrouwbaar, duurzaam en snel, en dit model zet die trend voort. Gebruikt een SATA-600 interface en hierdoor zeer compatibel met veel systemen. Door het MLC-geheugen kan hij officieel 2400TB schrijven maar dat zal in de praktijk zeer waarschijnlijk velen malen hoger uitvallen.
[Reactie gewijzigd door keranoz op 25 juli 2024 16:37]
Bron: Elcomsoft.com - Why SSDs Die a Sudden Death (and How to Deal with It)Why SSD Drives Fail with no SMART Errors
SSD drives are designed to sustain multiple overwrites of its entire capacity. Manufacturers warrant their drives for hundreds or even thousands complete overwrites. The Total Bytes Written (TBE) parameter grows with each generation, yet we’ve seen multiple SSD drives fail significantly sooner than expected. We’ve seen SSD drives fail with as much as 99% of their rated lifespan remaining, with clean SMART attributes. This would be difficult to attribute to manufacturing defects or bad NAND flash as those typically account for around 2% of devices. Manufacturing defects aside, why can an SSD fail prematurely with clean SMART attributes?
Each SSD drive has a dedicated system area. The system area contains SSD firmware (the microcode to boot the controller) and system structures. The size of the system area is in the range of 4 to 12 GB. In this area, the SSD controller stores system structures called “modules”. Modules contain essential data such as translation tables, parts of microcode that deal with the media encryption key, SMART attributes and so on.
If you have read our previous article, you are aware of the fact that SSD drives actively remap addresses of logical blocks, pointing the same logical address to various physical NAND cells in order to level wear and boost write speeds. Unfortunately, in most (all?) SSD drives the physical location of the system area must remain constant. It cannot be remapped; wear leveling is not applicable to at least some modules in the system area. This in turn means that a constant flow of individual write operations, each modifying the content of the translation table, will write into the same physical NAND cells over and over again. This is exactly why we are not fully convinced by endurance tests such as those performed by 3DNews. Such tests rely on a stream of data being written onto the SSD drive in a constant flow, which loads the SSD drive in unrealistic manner. On the other side of the spectrum are users whose SSD drives are exposed to frequent small write operations (sometimes several hundred operations per second). In this mode, there is very little data actually written onto the SSD drive (and thus very modest TBW values). However, system areas are stressed severely being constantly overwritten.
Such usage scenarios will cause premature wear on the system area without any meaningful indication in any SMART parameters. As a result, a perfectly healthy SSD with 98-99% of remaining lifespan can suddenly disappear from the system. At this point, the SSD controller cannot perform successful ECC corrections of essential information stored in the system area. The SSD disappears from the computer’s BIOS or appears as empty/uninitialized/unformatted media.
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