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OWC Accelsior 4M2 PCIe SSD
6000 MB/sec!
Mac or PC.


Ideal for Lightroom, Photoshop, video.
Capacity up to 16TB!

New vs Seasoned Crucial M225 256GB

Last updated 2010-04-26 - Send Feedback
Related: SSD, storage

See review and specifications. Has no over-provisioning; consumer grade. It looked reasonable a year ago and performs well in general, but my very lightly used one (travel laptop) failed completely after eight months (test unit is a brand-new one).

I have used several M225 units of 128GB and 256GB capacity, and I can no longer recommend them: one failed completely, one degraded badly and never fully recovered, and the others were test units which also degraded quickly.

Performance brand-new and after seasoning

The Crucial M225 starts out looking decent though inconsistent. Note that the rated write speed of 220MB/sec is good only in virgin state: the very 2nd fill-volume (not shown) it drops by about 15%! This behavior is true for every Crucial M225 I’ve used (4 or 5 of them). I find this misleading marketing claim completely unacceptable and at odds with reality.

After seasoning , the M225 degrades severely for writes, right down to the speed of USB 2 (about 30MB/sec)! Egads. Even reads are impaired (“With read speeds up to 250MB/s...”), the weasel phrase being “up to”. This is a pathetic performance.

In the graph below, reads are green and writes are red. The heavier line is the seasoned result.

Average speed across the volume
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!
Save Big $$$$ on Memory for 2019 Mac Pro

Up to 65% better pricing than Apple

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



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Peak Design Everyday Backpack (20L, Heritage Tan)
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