Downloading Sonnet USB 3.0 ExpressCard Driver 1.0 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available. This free Mac app was originally produced by Sonnet Technologies, Inc. According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software.
From the developer:
This Sonnet USB 3.0 ExpressCard Driver software enables USB 3.0 transfer speeds with Sonnet's Allegro USB 3.0 PCIe (part number USB3M-E) and USB 3.0 ExpressCard/34 (part number USB3-2PM-E34) in computers running Mac OS X.
Important Notes:Sonnet's original USB 3.0 cards, Allegro USB 3.0 PCIe (part number USB3-E) and USB 3.0 ExpressCard/34 (part number USB3-2P-E34), are NOT supported.
You may want to check out more Mac applications, such as Tempo SATA Edge ExpressCard/34 or Free Mac USB Flash Drive Data Recovery, which might be related to Sonnet USB 3.0 ExpressCard Driver.
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