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OWC Envoy Pro EX SSD
Blazingly fast Thunderbolt 3 SSD!

Up to 4TB capacity, USB-C compatible.

USB-C model also available


Great for travel or for desktop!

Restoring solid state drive performance with DiskTester ‘recondition’

After the severe duty test with the Intel 160GB G2 solid state drive, I wanted to see whether the DiskTester recondition facility could restore more uniform performance to the erratic Intel SSD.

Note: reconditioning is not needed for the OWC Mercury Extreme Pro, since it takes a beating and just keeps on working. But many brands of SSDs degrade in performance over time, and benefit from periodic reconditioning.

How DiskTester helps

Reconditioning a solid state drive (SSD)

DiskTester’s recondition command can be used on any solid state drive, even your boot drive. It’s faster to recondition a mostly empty drive, but it’s not required.

Reconditioning has no effect on your data, as it writes only to a temporary file using standard Mac OS X APIs. Your files are never touched during reconditioning, but note that some brands of SSDs can and do fail, especially if they are in bad shape to begin with, with a short lease on life. Be sure you have a backup.

DiskTester provides steady progress showing min/max/current/average speed, so you can decide when you have seen enough improvement. DiskTester stops after the equivalent of 4 full passes over all the capacity eg 640GB for a 160GB drive.

Get DiskTester here.

Graphing the results

When DiskTester has finished reconditioning, it presents a small table of results, which can be pasted into the supplied spreadsheet graph template.

In the graph below, we can see that in just one pass, DiskTester has:

  • Raised the average (green line) speed of the Intel 160GB SSD from 80 to 103MB/sec.
  • Raised the minimum speed (blue line) from 17MB/sec to 90MB/sec.

The maximum speed declined slightly, but that is not significant, as it represents a very brief blip, as examining the detailed output shows.

Performance with 4 iterations of recondition (3 shown 4th is the same as 3rd)

Before and after performance

These two graphs show behavior before and reconditioning, using DiskTester fill-volume.

After the severe duty test, the Intel 160GB G2 is looking quite ragged on the writes, with huge dips in speed, an erratic performance.

Average speed across the volume BEFORE

And here is the behavior after reconditioning:

Average speed across the volume AFTER
OWC Accelsior 4M2 PCIe SSD
6000 MB/sec!
Mac or PC.


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Capacity up to 16TB!
Save Big $$$$ on Memory for 2019 Mac Pro

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Lloyd recommends 32GB RDIMM modules for most users (more expensive LRDIMMS are for 512GB or more).



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