Allegro USB 3.0 PCIe
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Driver (3)
Firmware (0)
Manual (2)
FAQ (9)
IDArticle TitlePost Date
523 Does the Sonnet Allegro USB 3.0 PCIe card support the Blackmagic Intensity Shuttle, Pocket UltraScope, and UltraStudio Pro?May-03-11
641 Why is my USB 3.0 card reporting a USB 2.0 connection to a USB 3.0 storage device?Jan-10-12
668 Does my Sonnet USB 3.0 card work with OS X 10.7.5?Sep-04-12
681 Are Sonnet's USB 3.0 cards compatible with OS X 10.8 (Mountain Lion)? Sep-04-12
Yes, when you install the Sonnet USB 3.0 Driver (Mac) version 1.0.8 or later.
 
726 Does the Allegro USB 3.0 card support bus-powered drives? Nov-27-13
The Allegro USB 3.0 card does not provide enough power for most USB 3.0 2.5" bus-powered drives and SSDs.

The Allegro USB 3.0 card powers bus-powered thumb drives just fine during wake, but does not have power for any bus-powered drives during sleep. In a Mac Pro, bus-powered drives will disconnect upon wake and need to be unplugged and plugged after sleep to reappear on the desktop. In a Windows machine, the drives appear normally after sleep. Wall powered drives do not have any issues with sleep in any machine.
 
732 Do the Sonnet Allegro USB 3.0 cards support Thumb Drives?Oct-24-13
756 Do the Sonnet USB 2.0 or USB 3 cards support the Apple SuperDrive?Apr-02-22
759 My bus-powered USB 3 drive or SSD will not reliably mount or transfer data.Dec-14-19
High power bus-powered drives are supported by the current and recent line of Sonnet USB 3 cards, plus the Tango 3.0 PCIe (FW8USB3A-E) cards, but not the discontinued USB 3.0 PCIe cards (USB3-E or USB3M-E), the initial version of the Tango 3.0 PCIe card (FWUSB3-E), or any USB 2.0 cards.

If you are still having trouble, this may be a problem due to a voltage drop in the USB cable. Use the following guide to select the correct cable for your application.

In general, these cables should work with SSDs or optical drives drawing up to 2A of current:

Type........Power-Carrying Wires....Cable Outside Diameter....Maximum Cable Length
USB 2.0..........28 AWG...............................3.8mm...........................0.15m (0.5 ft)
USB 2.0..........24 AWG...............................4.7mm...........................0.3m ( 1 ft)
USB 2.0..........22 AWG...............................5.0mm..............................1m ( 3 ft)
USB 3.0..........20 AWG...............................6.0mm..............................1m ( 3 ft)

Generally, the gauge of the power-carrying wires can be inferred from the cable outside diameter.
 
817 Storage connected to a USB 3 PCIe card (or Tango combo card) gives an macOS error message upon wake from sleep.May-12-20