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Upgrade the memory of your 2020 iMac up to 128GB

RAID-5 vs RAID-4 with SSDs

OWC Thunderbay Mini

Thunderbay Mini configurations start at about $379 without drives. Thunderbay Mini RAID-5 edition also available.

RAID-4 is striping with a dedicated parity drive
RAID-5 is striping with distributed parity

MPG tested the throughput of the OWC Thunderbay 4 Mini using DiskTester run-sequential-suite on a late 2013 MacBook Pro Retina (Thunderbolt 2).

disktester run-sequential-suite --xfer-steps 4 --test-size 2G--starting-xfer 64K --ending-xfer 256MB

With 4 OWC Mercury Extreme Pro 6G SSDs, RAID-4 outperforms RAID-5 by about 10% for reads (compare green and blue lines). Write performance is identical.

Findings might or might apply to hard drives, whose performance characteristics differ from SSDs.

OWC Thunderbay Mini performance: 4 OWC 6G SSDs, RAID-4 vs RAID-5 for varying transfer size

Filling the entire volume with disktester fill-volume, observe that write speed for RAID-4 and RAID-5 is identical on SSDs. But read speed is about 12% higher for RAID-4.

disktester fill-volume --xfer 128M

OWC Thunderbay Mini performance: 4 OWC 6G SSDs, RAID-4 vs RAID-5 sustained transfer speed
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!
OWC Thunderblade Thunderbolt 3 SSD

Blazing fast, up to 16TB.

YEE HAH!



√ No more slow and noisy hard drives!
OWC Accelsior 4M2 PCIe SSD
6000 MB/sec!
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Capacity up to 16TB!
OWC Envoy Pro Elektron

Ultra-high performance across entire capacity, outperforms the competition.

Tiny, bus-powered, rugged, compact!


√ No more slow and noisy hard drives!

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