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SanDisk Professional PRO-G40 SSD 2TB External SSD Review

We re-formatted the drive to NTFS so we could run some of our benchmarks. To test the drive in its Thunderbolt 3 mode we used an Asus ThunderboltEX3 add-in card.

Thanks to Asus for their support with this. You can see more information on this card on the ASUS site, over HERE

CrystalDiskMark is a useful benchmark to measure the theoretical performance levels of hard drives and SSDs. We are using V7.

The ATTO Disk Benchmark performance measurement tool is compatible with Microsoft Windows. Measure your storage systems performance with various transfer sizes and test lengths for reads and writes. Several options are available to customize your performance measurement including queue depth, overlapped I/O and even a comparison mode with the option to run continuously.
Use ATTO Disk Benchmark to test any manufacturer's RAID controllers, storage controllers, host adapters, hard drives and SSD drives and notice that ATTO products will consistently provide the highest level of performance to your storage.

AS SSD is a great free tool designed just for benching Solid State Drives. It performs an array of sequential read-and-write tests, as well as random read-and-write tests with sequential access times over a portion of the drive. AS SSD includes a sub suite of benchmarks with various file pattern algorithms but this is difficult in trying to judge accurate performance figures.

Thunderbolt 3

The 2TB PRO-G40 is rated as up to 2,700MB/s and 1,900MB/s for read and writes respectively when using a Thunderbolt 3 connection. Using the ATTO and AS SSD benchmarks we couldn't quite hit that maximum read figure with test results of 2,590MB/s and 2,459MB/s. However, when it came to Sequential writes the drive sailed past the official maximum figure with an ATTO result of 2,380MB/s and 2,216MB/s from the AS SSD benchmark.

Using the CrystalDiskMark 8 benchmark we could confirm and indeed slightly better the official read figure with a best test result of 2,779MB/s (Peak Performance profile). As with the ATTO and AS SSD benchmarks the Crystal DiskMark Sequential write results were much better than the official figure.

USB 3.2 Gen 2.

With the drive connected to a USB 3.2 Gen 2 port, we couldn't quite hit the official maximums of the drive in any of our tests. The best Sequential read result we saw was 1,010MB/s (from using the CrystalDiskMark Peak Performance profile) just 40MB/s shy of the official maximum performance figure. The best write figure we saw was 962MB/s, again from the CrystalDiskMark Peak Performance profile and once again it came up short of the official 1,000MB/s figure.

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