Review: Sandisk Extreme PRO 240GB SSD


Some renowned flash memory manufacturers also produce some of the best SSDs you can find. SanDisk is a good example of this with a varied catalog, and you can also find really attractive prices. The one we present you today is their last high-end creation for SATA interface.

The Sandisk Extreme PRO is a lightweight format disc but it has a powerful controller that incorporates a new system cache to maintain solid performances of the unit over its lifetime. It’s a unit with a rare, easy to manage security for the user and excellent for improving the performance of all kinds of systems, especially laptops.

Sandisk Extreme PRO 240GB

While the speeds of the disks with SATA interface have stopped surprising us, they’re still the ones that we all seek and use as a base for all kinds of systems, whether to improve the performance of our new economic laptop, improve an old computer, or having extra quality storage on a desktop computer. It is best that prices now are not those of before and that allows us to gradually forget the mechanical drive in all kinds of systems, no matter how economic they are.

Sandisk Extreme PRO 240GB

Sandisk offers you on this model a truly lightweight unit; some would say that it looks too fragile, perfect to be mounted in portable systems where even it can save you a few grams to carry in your backpack. You can find it in three storage capacities: 240, 480 and 960GB.

Prices range between the 150 euros of the 240GB model, which we have discussed here, 250 Euros for the 480GB model and the 960GB model that can be found for just fewer than 430 Euros. These are not certainly the cheapest models with these capabilities, neither from Sandisk’s own catalog itself, but these are very competitive prices. This unit competes with the best units of Samsung, OCZ, Plextor, Kingston, Corsair, etc.

By cutting capacity it is clear that Sandisk reserves some drive space for the relocation of defective cells. The unit uses technologies such as TRIM and an internal control through an intermediate cache that reduces cell wear and maintains performance throughout the shelf life of the unit.

This system has been called Sandisk nCache Pro. It was once a buffer to the disk’s firmware itself and its internal processes, but now it seems that Sandisk has also incorporated it to data treatment itself, though the scope seems limited. It also has a temperature control system, which controls the performance of the controller to increase the shelf life of the components.

The integrated controller is an old acquaintance. It is a Marvell 88SS9187 that Sandisk had used in previous generations such as the Extreme II. What has been done is that they improved the performance with a much more refined firmware (Sandisk has its own development team) and incorporated better NAND memories, specifically, the second generation of 19nm MLC 64Gbit memories. They are very similar to the Toshiba A19nm memories.

There are no great miracles, however, in its technical performance. Here is a comparison chart of the three models currently sold.

Capacity 240G 480G 960G
Controller Marvell 88SS9187 Marvell 88SS9187 Marvell 88SS9187
NAND Memory
Sandisk 2nd Generation 64Gbit 19 nm MLC
DRAM Cache 512MB 1GB 1GB
Sequential reading 550 MB/s 550 MB/s 550 MB/s
Sequential writing 520 MB/s 515 MB/s 515 MB/s
4KB Random reading 100K IOPS 100K IOPS 100K IOPS
4KB Random writing 90K IOPS 90K IOPS 90K IOPS
Power usage (idle) 5.5mW 19mW 19mW
Power usage (read | write) 2.7W | 2.6W 2.7W | 3.5W 2.9W | 3.6W
Endurance (terabyte written) >80TB >80TB >80TB

Format and energy consumption

The Sandisk Extreme PRO is a disc of just 7mm high, which is practically the standard. A standard that has been forced by new generations of progressively thinner portables. Laptops that on the other hand usually no longer use these formats in favor of other technologies such as mSATA and M.2. Anyway, all disks that have been sold for some time are all of 7mm height and, luckily, Sandisk adds an adhesive adapter for you to use it racks or other systems that are better suited to 9.5mm height formats.

Sandisk Extreme PRO 240GB

The consumption of this Sandisk unit is announced in 0,13w, but that is only when "on". When you load this model it is closer to the consumption of any high-end unit. That is, closer to 4w consumption than 3 watts (its actual consumption is 3.6W). This, as we have already been saying for some time, debunks the argument that SSDs consume less than mechanics. A mechanical drive, in this same format, can allow for a power consumption of less than 2W. The ultra fast controllers that integrate these units make them more demanding on an energy level.

Sandisk Extreme PRO 240GB

Performance Tests

We have submitted the Sandisk Extreme PRO through our usual battery of tests and we also added some interesting tests, so you can have a little more detail of the performance of this unit. It is a flexible disk, quite in line with the best.

Data transfer scores:

Data transfer scores

PC Mark 8 SSD Storage Score:

PC Mark 8 SSD Storage Score

Other results:


These are the synthetic benchmarks tests, but based on real usage. It loads a game in less than 6 seconds.

HD Tune Pro

HD Tune Pro confirms the general data on this disk with a processing speed close to 95,000 IOPS in read and about 85,000 in writing speed.

Analysis and Conclusion

A unit of this quality leaves us feeling comfortable with its performance, as you will have that sense of immediacy of system load, app startup, of being among the first to enter a game … which is what we primarily seek in an SSD. The advantage of purchasing the Sandisk Extreme PRO is that it guarantees that for 10 years, apparently without writing limit in the unit, which makes it a leader in this niche.

There are many good SATA SSDs units today, perhaps the evolution should go now to reduce consumption, and Sandisk Extreme PRO is certainly among the best. A brand with a proud history and a guarantee of quality, combined with discs of excellent workmanship. Highly recommended.

Read More:
SLC, MLC and TLC, what’s the difference?

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