All Posts by Date or last 15, 30, 90 or 180 days.
also by Lloyd: photography and
Thank you for purchasing through links and ads on this site.
diglloyd Deal Finder...
Buy other stuff at
Upgrade the memory of your 2018 Mac mini up to 64GB
Handpicked deals...
$3698 $2998
SAVE $700

$2397 $1897
SAVE $500

$1199 $898
SAVE $301

$1299 $1169
SAVE $130

$4499 $3999
SAVE $500

$1399 $1099
SAVE $300

$1499 $1299
SAVE $200

$4499 $3149
SAVE $1350

$2299 $1599
SAVE $700

$2498 $2198
SAVE $300

$1799 $1379
SAVE $420

$2998 $2498
SAVE $500

$2199 $1999
SAVE $200

$430 $220
SAVE $210

$3399 $2199
SAVE $1200

$6299 $3599
SAVE $2700

$398 $278
SAVE $120

$1499 $1019
SAVE $480

$1279 $719
SAVE $560

$1699 $1549
SAVE $150

Summary So Far of Apple Fusion Technology — Attempted on MacMini, Mac Pro

Apple Fusion technology = a combination of an SSD and a hard drive into a single desktop volume in which the system migrates frequently used files to the SSD to enhance performance.

Apple offers the Fusion drive with the new Mac Mini and the new iMac (which ships in December). The speculation has been that the Fusion technology might work with non-Apple drives.

Note that I have not tested an official Apple “Fusion” setup. My goal has been to see if a 3rd-party SSD plus Apple HDD can work.

What I’ve found so far:

  • Using an OWC 240GB 6G SSD + 1TB hard drive in MacMini, no Fusion “migration” occurs. In short, the Fusion technology does not work with a 3rd party SSD, operating instead as “dumb” JBOD. Apparent reports to the contrary leave me skeptical, or that the model/brand of SSD might matter.
  • The “special” version of Disk Utility is indeed a new build (444), complete with a bug that is eager to merge two separate internal drives/volumes in a Mac Mini. To erase or verify or repair internal drives, one will have to obtain a non-special version of Disk Utility (build 430), or use the command line 'diskutil' until this bug is fixed.
  • On a Mac Pro running OS X 10.8.2 with either a PCIe SSD or SATA SSD, the Fusion technology does not work, operating as “dumb” JBOD.

Other claims based on 'dd'

My testing shows that using 'dd' is a totally inappropriate way to measure disk I/O speed— Disktester reads the same file ~19 times faster than 'dd' (from the SSD or cache, about ~3.8X faster from the HDD).

MPGmini:test admin$ dd if=blob-0999.blob  bs=65536
4096+0 records in
4096+0 records out
268435456 bytes transferred in 9.582504 secs (28013080 bytes/sec)
= 26.7 MB/sec
MPGmini:test admin$ disktester read-files blob-0999.blob
DiskTester 2.2 64-bit, diglloydTools 2.2 fc5, 2012-10-28 13:40
Read 1 files totaling 256MB in 0.5 seconds @ 511MB/sec

Furthermore, 'dd' uses the OS X unified buffer cache, so it doesn’t measure disk speed at all if the data is cached.

Hence I dismiss the 'Fusion' claims in their entirety as unreliable, and an apparent failure in test methodology.

Save the tax, we pay you back, instantly!
View all handpicked deals...

Nikon AF-S NIKKOR 24-70mm f/2.8E ED VR Lens
$2397 $1897
SAVE $500 | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2019 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__