SanDisk Unveils World’s First Massive 4TB SD Card



Western Digital has announced the launch of the world’s first 4TB SD card, with shipments of this new capacity point slated to begin in 2025.

WD showcased the 4TB SanDisk Extreme PRO SDUC UHS-I memory card (slightly larger than the image at the top of this article) at the National Association of Broadcasters (NAB) show this week, targeting broadcast companies and content creators.

WD did not disclose the price of the new 4TB card. The card uses a speed class 10 UHS-I bus. WD’s SD card also meets the Video Speed Class V30, supporting a minimum sequential write speed of 30 MB/s, believed to be sufficient for 8K video recording needs.

Western Digital’s SanDisk Extreme Pro SDUC 4TB SD card conforms to the Secure Digital Ultra Capacity standard (SDUC, supporting up to 128TB). The card utilizes the ultra-high-speed-I (UHS-I) interface with a speed class rating of 10, thus supporting minimum speeds of 10 MB/s and a maximum data transfer rate of 104 MB/s when operating under UHS104 (SDR104) mode (there is a performance question, which will be discussed in detail later). WD’s SD card also meets the Video Speed Class V30 standard, supporting a minimum sequential write speed of 30 MB/s, believed to be adequate for 8K video recording needs, surpassing the cards that Western Digital primarily aims at the 4K video market about to be launched.

Although the capacity point of the new card is approaching that of more traditional SSDs, you may not want to consider using these cards for long-term storage. The lifespan of SD cards depends on the type of memory used, environmental conditions, and other factors, typically estimated to be around ten years. Please consider using one of our best SSDs or external drives.

WD also introduced the 24TB G-Drive, an external desktop hard drive priced at $699. You can also spend $929 on a similar 24TB G-Drive Project, which includes 40Gbps Thunderbolt 3/USB-C ports (a bit overkill for a drive with only 260MB/s read/write throughput) and a 48TB version (mirrored drive) priced at $1,599. The latter uses an additional 24TB as a RAID-1 mirrored backup.

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