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The Sony CFexpress Type A Memory Card is designed for professional filmmakers and high-speed photographers who require reliable, high-bandwidth storage for intensive 4K and 8K video production. It delivers industry-leading read speeds of up to 800MB/s and write speeds of up to 700MB/s, making it an essential upgrade for Sony camera users to maximize buffer clearance and recording stability. While it offers significantly higher performance than standard SDXC media, potential users should note it is only compatible with cameras specifically equipped with CFexpress Type A slots.
| Series | CFexpress Type A |
|---|---|
| Model Part Number | CEA-G640T |
| Brand | Sony |
No, CFexpress Type A cards have a different physical form factor and pin layout than SD cards and are not interchangeable.
Yes, the high write speeds of the CEA-G640T are designed to support the demanding bitrate requirements of high-resolution 8K video.
Yes, you must use a reader specifically designed for CFexpress Type A media to achieve maximum transfer speeds.
The card is built for professional durability; however, it should always be kept away from extreme environmental hazards and direct liquid exposure.
Always format the card inside the camera body using the 'Format' or 'Initialize' option in the setup menu to ensure optimal performance.
Power off the camera, remove the card, inspect the gold contacts for debris, and reinsert securely. If the error persists, attempt to format the card via the camera menu.
Ensure you are using a dedicated CFexpress Type A card reader connected to a USB 3.2 Gen 2 or higher port on your computer.
To ensure peak performance, always format the card within your camera's menu system before initial use to ensure the file system structure is optimized for your specific Sony model. This card is compatible with Sony cameras featuring CFexpress Type A slots, including the Sony FX6, FX3, a1, a7S III, and a7 IV.
When not in use, store the card in a protective case to prevent terminal damage. While the card is durable, avoid exposing the gold contact pins to moisture, dust, or static electricity. When transferring data to a computer, use a high-quality Sony CFexpress Type A card reader to ensure that the 800MB/s read speeds are fully utilized.
