All Posts by Date or last 15, 30, 90 or 180 days.
also by Lloyd: diglloyd.com photography and WindInMyFace.com

Thank you for buying via links and ads on this site,
which earn me advertising fees or commissions.
As an Amazon Associate I earn from qualifying purchases.

Other World Computing...
B&H Photo...
Amazon
As an Amazon Associate I earn from qualifying purchases.
Upgrade the memory of your 2020 iMac up to 128GB
877-865-7002
Today’s Deal Zone Items... Handpicked deals...
$1199 $779
SAVE $420

$250 $200
SAVE $50

$1699 $1299
SAVE $400

$1499 $1149
SAVE $350

$200 $140
SAVE $60

$89 $69
SAVE $20

$120 $35
SAVE $85

$178 $148
SAVE $30

$3498 $2998
SAVE $500

$3699 $1299
SAVE $2400

$1000 $700
SAVE $300

$3899 $1499
SAVE $2400

$748 $648
SAVE $100

$2999 $1999
SAVE $1000

$1699 $999
SAVE $700

$1698 $1398
SAVE $300

$4499 $4499
SAVE $click

$1399 $1049
SAVE $350

$1149 $799
SAVE $350

$1399 $1049
SAVE $350

$1498 $1198
SAVE $300

$2797 $2597
SAVE $200

$280 $250
SAVE $30

$699 $699
SAVE $click

$1699 $1299
SAVE $400

$8399 $8399
SAVE $click

$899 $799
SAVE $100

$1699 $1299
SAVE $400

Install the Driver for the OWC Mercury Accelsior PCIe SSD (OS X Cuts Power Prematurely to PCIe)

See also Caution When Upgrading to OS X Mavericks: Kernel Extensions (ATTO, Drobo).

The OWC Mercury Accelsior PCIe SSD requires that a driver be installed to address an OS X power cut behavior* (see details further below). This blog post is a reminder of sorts.

OWC includes the driver for the Accelsior card as shipped and calls it out visually in the packaging, but one could forget to install it either at initial install or when installing a fresh system. For example, if you’re testing out Mavericks as a fresh system install, install the driver for the Accelsior PCIe SSD. Ditto for any fresh system install.

If the Accelsior PCIe SSD is used in the OWC Mercury Helios case, then a driver is not needed. As per OWC:

Note: Driver ensures proper power-down of Accelsior during sleep, restart, and shutdown actions that may otherwise not occur in the Mac Pro with PCIe connected drive volumes. This driver does not affect or interact with other drivers, software applications, hardware devices, etc.

This driver is not required for use of Accelsior in Thunderbolt to PCIe Expansion chassis (such as OWC Helios). No driver is required for use of Accelsior for Windows or Linux operating systems.

How to check if the Accelsior driver is installed:
About This Mac => More Info => System Report

* The OWC driver for the Accelsior PCIe SSD addresses a behavior (bug) introduced in OS X in which power is cut off prematurely to PCIe cards. This premature power cut-off bug was introduced in an OS X release a good time after I first tested and reported on the Accelsior.

The driver for the Accelsior PCIe SSD inserts a sub-second delay, giving the PCIe card time to finish its business (pending writes). Under Microsoft Windows on the same machine, no driver is needed (because the OS does not have this bug).

The power cut issue would apply to any PCIe card that needs time to do housekeeping before the power is cut, e.g. a hardware RAID card or other PCIe SSD.

Upgrading to the E2

Separately and not related to the above, MPG recommends upgrading to the Accelsior E2 version to gain a new chipset and dual eSATA ports. This is a module swap onto a replacement (bare) card.

OWC Mercury Accelsior E2 PCIe SSD (with flash modules), and prior Accelsior (without flash modules)
OWC Envoy Express

World’s first Thunderbolt 3 M.2 NVME SSD enclosure.

Super fast, bus-powered, 3.3 oz, DIY easy, rugged and compact!


See also OWC Express 4M2
√ No more slow and noisy hard drives!
OWC Accelsior 4M2 PCIe SSD
6000 MB/sec!
Mac or PC.


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

Deals Updated Daily at B&H Photo
View all handpicked deals...

LG UM7370PUA 70" Class HDR 4K UHD Smart LED TV
$1199 $779
SAVE $420

diglloyd.com | Terms of Use | PRIVACY POLICY
Contact | About Lloyd Chambers | Consulting | Photo Tours
Mailing Lists | RSS Feeds | Twitter
Copyright © 2020 diglloyd Inc, all rights reserved.
Display info: __RETINA_INFO_STATUS__