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Sonnet SF3 Series – CFast 2.0 Thunderbolt Pro Card Reader


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Superior Dual-Slot Ingest Performance

With the increasing popularity of professional digital cinema cameras from RED®, Canon®, ARRI®, and Blackmagic Design, the use of CFast™ 2.0 memory cards has soared, and the need for a truly high-speed card reader is undeniable. With current CFast 2.0 cards’ rated read speeds near 550 MB/s, it’s clear that USB readers don’t fill that need. Sonnet’s SF3™ Series – CFast 2.0 Pro Card Reader does. Featuring a 40Gbps Thunderbolt™ interface, this pro media card reader quickly ingests footage from CFast memory cards to any Mac or Windows computer with Thunderbolt 4 or Thunderbolt 3 ports at the fastest speeds the cards will support.

Ingest from Two Cards at the Same Time

As the industry’s first CFast 2.0 card reader for Thunderbolt, Sonnet’s SF3 Series – CFast 2.0 Pro Card Reader employs its dual card slots to take advantage of the tremendous bandwidth offered by Thunderbolt technology. This CFast 2.0 reader is capable of ingesting media files simultaneously from two cards at concurrent data transfer speeds up to 1000+ MB/s — more than double the average ingest speed of USB 3.0 card readers — using the Sonnet reader makes for a significantly more convenient and efficient workflow.

No Power Adapters Required

The SF3 Series – CFast 2.0 Pro Card Reader connects directly to your Mac or Windows computer’s Thunderbolt 4 or Thunderbolt 3 port or at the end of a Thunderbolt device chain. Requiring only a single cable to connect to your computer, this high-performance Sonnet reader is bus powered (no separate power supply required).

Designed for DIT Workflows

Sonnet’s SF3 Series pro card readers include threaded mount points that enable you to securely attach two readers side-by-side on a rack tray in just 1U of rack space.

Portable, Rugged, Stackable

Measuring a compact 5.8 inches wide by 1 inch high by 3.5 inches deep, the SF3 Series – CFast 2.0 Pro Card Reader is suitable for use in any workspace, even where space is tight. The reader’s shell is made from extruded aluminium, making it lightweight, and yet rugged enough to be transported in an equipment bag without fear of damaging the case.

Designed to be Stacked and Daisy Chained

SF3 Series pro card readers feature rugged aluminum enclosures designed to be stacked and daisy chained, enabling multiple AJA PAK Media, CFast 2.0, CFexpress™/XQD™RED MINI-MAG®, and SxS™ PRO X readers to occupy the same footprint, while connecting to your computer through a single cable. You can take advantage of Thunderbolt’s up to 2800 MB/s of PCIe 3.0 x4 bandwidth to ingest four, six, or more cards simultaneously!

Fastest External Interface Available

Featuring a 40Gbps Thunderbolt interface, this reader ingests footage from all CFast memory cards to Mac and Windows computers with Thunderbolt 4 or Thunderbolt 3 ports — on location, in the studio, or in the edit suite — at up to the fastest speeds the cards will support.


Never Lose It. Easily Replaceable.

Through the use of a captive cable, the SF3 Series – CFast 2.0 Pro Card Reader’s 40Gbps Thunderbolt cable remains firmly connected to it at all times. Should the cable ever break, it can easily be replaced with an approved replacement cable available from Sonnet or a Sonnet-authorized service centre.


Key Features:

  • Superior Ingest Performance – Ingests footage from CFast 2.0 cards at up to maximum supported speeds. Simultaneously ingest from two cards at full speed.
  • Dual CFast 2.0 Slots – Enable simultaneous ingest of files from two cards up to 1000+ MB/s aggregate.
  • PCIe 3.0 x4 Thunderbolt Device – This Thunderbolt 3 device provides four lanes of PCIe 3.0 (two lanes to each card slot). Thunderbolt 4 would be limited to one lane total.

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