Western Digital Previews 4 TB SD Card: World's Highest-Capacity
Western Digital this week is previewing the industry's first 4 TB SD card. The device is being showcased at the NAB trade show for broadcasters and content creators and will be released commercially in 2025.
Western Digital's SanDisk Extreme Pro SDUC 4 TB SD card complies with the Secure Digital Ultra Capacity standard (SDUC, which enables up to 128TB). The card uses the Ultra High Speed-I (UHS-I) interface and is rated for speed Class 10, therefore supporting a minimum speed of 10 MB/s and a maximum data transfer rate of 104 MB/s when working in UHS104 (SDR104) mode (there is a catch about performance, but more on that later). WD's SD card is also rated to meet Video Speed Class V30, supporting a minimal sequential write speed of 30 MB/s, which is believed to be good enough for 8K video recording, above and beyond the 4K video market that Western Digital is primarily aiming the forthcoming card at.
For now, Western Digital is not disclosing what NAND is in the SanDisk Extreme Pro SDUC 4 TB SD card. Given the high capacity and relatively distant 2025 release date, WD may be targetting this as one of their first products to use their forthcoming BiCS 9 NAND.
And while not listed in WD's official press release, we would be surprised if the forthcoming card didn't also support the off-spec DDR200/DDR208 mode, which allows for higher transfer rates than the UHS-I standard normally allows via double data rate signaling. Western Digital's current-generation SanDisk Extreme Pro SDXC 1 TB SD card already supports that mode, allowing it to reach read speeds as high as 170 MB/s, so it would be surprising to see the company drop it from newer products. That said, the catch with DDR208 remains the same as always: it's a proprietary mode that requires a compatible host to make use of.
Western Digital has not disclosed how much will its SanDisk Extreme Pro SDUC 4 TB SD card cost. A 1 TB SanDisk Extreme Pro card costs $140, so one can make guesses about the price of a 4 TB SD card that uses cutting-edge NAND.
Storage
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![](https://twitter.com/share?url=https://compbuddey.blogspot.com/2024/04/western-digital-previews-4-tb-sd-card_15.html&text=Western Digital Previews 4 TB SD Card: World's Highest-Capacity <p align="center"><a href="https://www.anandtech.com/show/21349/western-digital-rollsout-4-tb-sd-card-worlds-highestcapacity"><img src="https://images.anandtech.com/doci/21349/western-digital-sandisk-sd-card-4tb-678_575px.jpg" alt="" /></a></p><p><p>Western Digital this week is previewing the industry's first 4 TB SD card. The device is being showcased at the NAB trade show for broadcasters and content creators and will be released commercially in 2025.</p>
<p>Western Digital's SanDisk Extreme Pro SDUC 4 TB SD card complies with the Secure Digital Ultra Capacity standard (SDUC, which enables up to 128TB). The card uses the Ultra High Speed-I (UHS-I) interface and is rated for speed Class 10, therefore supporting a minimum speed of 10 MB/s and a maximum data transfer rate of 104 MB/s when working in UHS104 (SDR104) mode (there is a catch about performance, but more on that later). WD's SD card is also rated to meet Video Speed Class V30, supporting a minimal sequential write speed of 30 MB/s, which is believed to be good enough for 8K video recording, above and beyond the 4K video market that Western Digital is primarily aiming the forthcoming card at.</p>
<p>For now, Western Digital is not disclosing what NAND is in the SanDisk Extreme Pro SDUC 4 TB SD card. Given the high capacity and relatively distant 2025 release date, WD may be targetting this as one of their first products to use their forthcoming BiCS 9 NAND.</p>
<p>And while not listed in WD's official press release, we would be surprised if the forthcoming card didn't also support the off-spec DDR200/DDR208 mode, which allows for higher transfer rates than the UHS-I standard normally allows via double data rate signaling. Western Digital's current-generation SanDisk Extreme Pro SDXC 1 TB SD card already supports that mode, allowing it to reach read speeds as high as 170 MB/s, so it would be surprising to see the company drop it from newer products. That said, the catch with DDR208 remains the same as always: it's a proprietary mode that requires a compatible host to make use of.</p>
<p>Western Digital has not disclosed how much will its SanDisk Extreme Pro SDUC 4 TB SD card cost. A 1 TB SanDisk Extreme Pro card costs <a href="https://target.georiot.com/Proxy.ashx?tsid=45726&GR_URL=https%3A%2F%2Famazon.com%2FSanDisk-Extreme-UHS-I-Memory-SDSDXXD-1T00-GN4IN%2Fdp%2FB09X7CJ8H1%2F%3Ftag%3Dhawk-future-20%26ascsubtag%3Danandtech-us-1151086961647895437-20">$140</a>, so one can make guesses about the price of a 4 TB SD card that uses cutting-edge NAND.</p>
</p> Storage){kind=link}
![](https://www.pinterest.com/pin/create/button/?url=https://compbuddey.blogspot.com/2024/04/western-digital-previews-4-tb-sd-card_15.html&media=https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_sASUmlGoqBIhdOYQ-qOvuJsX5_Vn578DG4NOWkMNwdxKXDEmUX6VorIhwIerquwl6AQTf-y8TewZRgmZlStsALs6ilbxM9HjkUmvNBOi_azfd2iLLjdQjYu1dfjd_kOl5zYuJjELbNsp1fx54fMAgpMxGIBWHkS3wZVdw&description=Western Digital Previews 4 TB SD Card: World's Highest-Capacity <p align="center"><a href="https://www.anandtech.com/show/21349/western-digital-rollsout-4-tb-sd-card-worlds-highestcapacity"><img src="https://images.anandtech.com/doci/21349/western-digital-sandisk-sd-card-4tb-678_575px.jpg" alt="" /></a></p><p><p>Western Digital this week is previewing the industry's first 4 TB SD card. The device is being showcased at the NAB trade show for broadcasters and content creators and will be released commercially in 2025.</p>
<p>Western Digital's SanDisk Extreme Pro SDUC 4 TB SD card complies with the Secure Digital Ultra Capacity standard (SDUC, which enables up to 128TB). The card uses the Ultra High Speed-I (UHS-I) interface and is rated for speed Class 10, therefore supporting a minimum speed of 10 MB/s and a maximum data transfer rate of 104 MB/s when working in UHS104 (SDR104) mode (there is a catch about performance, but more on that later). WD's SD card is also rated to meet Video Speed Class V30, supporting a minimal sequential write speed of 30 MB/s, which is believed to be good enough for 8K video recording, above and beyond the 4K video market that Western Digital is primarily aiming the forthcoming card at.</p>
<p>For now, Western Digital is not disclosing what NAND is in the SanDisk Extreme Pro SDUC 4 TB SD card. Given the high capacity and relatively distant 2025 release date, WD may be targetting this as one of their first products to use their forthcoming BiCS 9 NAND.</p>
<p>And while not listed in WD's official press release, we would be surprised if the forthcoming card didn't also support the off-spec DDR200/DDR208 mode, which allows for higher transfer rates than the UHS-I standard normally allows via double data rate signaling. Western Digital's current-generation SanDisk Extreme Pro SDXC 1 TB SD card already supports that mode, allowing it to reach read speeds as high as 170 MB/s, so it would be surprising to see the company drop it from newer products. That said, the catch with DDR208 remains the same as always: it's a proprietary mode that requires a compatible host to make use of.</p>
<p>Western Digital has not disclosed how much will its SanDisk Extreme Pro SDUC 4 TB SD card cost. A 1 TB SanDisk Extreme Pro card costs <a href="https://target.georiot.com/Proxy.ashx?tsid=45726&GR_URL=https%3A%2F%2Famazon.com%2FSanDisk-Extreme-UHS-I-Memory-SDSDXXD-1T00-GN4IN%2Fdp%2FB09X7CJ8H1%2F%3Ftag%3Dhawk-future-20%26ascsubtag%3Danandtech-us-1151086961647895437-20">$140</a>, so one can make guesses about the price of a 4 TB SD card that uses cutting-edge NAND.</p>
</p> Storage){kind=link}
![](https://web.whatsapp.com/send?text=Western Digital Previews 4 TB SD Card: World's Highest-Capacity <p align="center"><a href="https://www.anandtech.com/show/21349/western-digital-rollsout-4-tb-sd-card-worlds-highestcapacity"><img src="https://images.anandtech.com/doci/21349/western-digital-sandisk-sd-card-4tb-678_575px.jpg" alt="" /></a></p><p><p>Western Digital this week is previewing the industry's first 4 TB SD card. The device is being showcased at the NAB trade show for broadcasters and content creators and will be released commercially in 2025.</p>
<p>Western Digital's SanDisk Extreme Pro SDUC 4 TB SD card complies with the Secure Digital Ultra Capacity standard (SDUC, which enables up to 128TB). The card uses the Ultra High Speed-I (UHS-I) interface and is rated for speed Class 10, therefore supporting a minimum speed of 10 MB/s and a maximum data transfer rate of 104 MB/s when working in UHS104 (SDR104) mode (there is a catch about performance, but more on that later). WD's SD card is also rated to meet Video Speed Class V30, supporting a minimal sequential write speed of 30 MB/s, which is believed to be good enough for 8K video recording, above and beyond the 4K video market that Western Digital is primarily aiming the forthcoming card at.</p>
<p>For now, Western Digital is not disclosing what NAND is in the SanDisk Extreme Pro SDUC 4 TB SD card. Given the high capacity and relatively distant 2025 release date, WD may be targetting this as one of their first products to use their forthcoming BiCS 9 NAND.</p>
<p>And while not listed in WD's official press release, we would be surprised if the forthcoming card didn't also support the off-spec DDR200/DDR208 mode, which allows for higher transfer rates than the UHS-I standard normally allows via double data rate signaling. Western Digital's current-generation SanDisk Extreme Pro SDXC 1 TB SD card already supports that mode, allowing it to reach read speeds as high as 170 MB/s, so it would be surprising to see the company drop it from newer products. That said, the catch with DDR208 remains the same as always: it's a proprietary mode that requires a compatible host to make use of.</p>
<p>Western Digital has not disclosed how much will its SanDisk Extreme Pro SDUC 4 TB SD card cost. A 1 TB SanDisk Extreme Pro card costs <a href="https://target.georiot.com/Proxy.ashx?tsid=45726&GR_URL=https%3A%2F%2Famazon.com%2FSanDisk-Extreme-UHS-I-Memory-SDSDXXD-1T00-GN4IN%2Fdp%2FB09X7CJ8H1%2F%3Ftag%3Dhawk-future-20%26ascsubtag%3Danandtech-us-1151086961647895437-20">$140</a>, so one can make guesses about the price of a 4 TB SD card that uses cutting-edge NAND.</p>
</p> Storage | https://compbuddey.blogspot.com/2024/04/western-digital-previews-4-tb-sd-card_15.html){kind=link}
![](mailto:?subject=Western Digital Previews 4 TB SD Card: World's Highest-Capacity <p align="center"><a href="https://www.anandtech.com/show/21349/western-digital-rollsout-4-tb-sd-card-worlds-highestcapacity"><img src="https://images.anandtech.com/doci/21349/western-digital-sandisk-sd-card-4tb-678_575px.jpg" alt="" /></a></p><p><p>Western Digital this week is previewing the industry's first 4 TB SD card. The device is being showcased at the NAB trade show for broadcasters and content creators and will be released commercially in 2025.</p>
<p>Western Digital's SanDisk Extreme Pro SDUC 4 TB SD card complies with the Secure Digital Ultra Capacity standard (SDUC, which enables up to 128TB). The card uses the Ultra High Speed-I (UHS-I) interface and is rated for speed Class 10, therefore supporting a minimum speed of 10 MB/s and a maximum data transfer rate of 104 MB/s when working in UHS104 (SDR104) mode (there is a catch about performance, but more on that later). WD's SD card is also rated to meet Video Speed Class V30, supporting a minimal sequential write speed of 30 MB/s, which is believed to be good enough for 8K video recording, above and beyond the 4K video market that Western Digital is primarily aiming the forthcoming card at.</p>
<p>For now, Western Digital is not disclosing what NAND is in the SanDisk Extreme Pro SDUC 4 TB SD card. Given the high capacity and relatively distant 2025 release date, WD may be targetting this as one of their first products to use their forthcoming BiCS 9 NAND.</p>
<p>And while not listed in WD's official press release, we would be surprised if the forthcoming card didn't also support the off-spec DDR200/DDR208 mode, which allows for higher transfer rates than the UHS-I standard normally allows via double data rate signaling. Western Digital's current-generation SanDisk Extreme Pro SDXC 1 TB SD card already supports that mode, allowing it to reach read speeds as high as 170 MB/s, so it would be surprising to see the company drop it from newer products. That said, the catch with DDR208 remains the same as always: it's a proprietary mode that requires a compatible host to make use of.</p>
<p>Western Digital has not disclosed how much will its SanDisk Extreme Pro SDUC 4 TB SD card cost. A 1 TB SanDisk Extreme Pro card costs <a href="https://target.georiot.com/Proxy.ashx?tsid=45726&GR_URL=https%3A%2F%2Famazon.com%2FSanDisk-Extreme-UHS-I-Memory-SDSDXXD-1T00-GN4IN%2Fdp%2FB09X7CJ8H1%2F%3Ftag%3Dhawk-future-20%26ascsubtag%3Danandtech-us-1151086961647895437-20">$140</a>, so one can make guesses about the price of a 4 TB SD card that uses cutting-edge NAND.</p>
</p> Storage&body=https://compbuddey.blogspot.com/2024/04/western-digital-previews-4-tb-sd-card_15.html){kind=link}
Kioxia Details BiCS 8 NAND at FMS 2024: 218 Layers With Superior Scaling 
Kioxia's booth at FMS 2024 was a busy one with multiple technology demonstrations keeping visitors occupied. A walk-through of the BiCS 8 manufacturing process was the first to grab my attention. Kioxia and Western Digital announced the sampling of BiCS 8 in March 2023. We had touched briefly upon its CMOS Bonded Array (CBA) scheme in our coverage of Kioxial's 2Tb QLC NAND device and coverage of Western Digital's 128 TB QLC enterprise SSD proof-of-concept demonstration. At Kioxia's booth, we got more insights.
Traditionally, fabrication of flash chips involved placement of the associate logic circuitry (CMOS process) around the periphery of the flash array. The process then moved on to putting the CMOS under the cell array, but the wafer development process was serialized with the CMOS logic getting fabricated first followed by the cell array on top. However, this has some challenges because the cell array requires a high-temperature processing step to ensure higher reliability that can be detrimental to the health of the CMOS logic. Thanks to recent advancements in wafer bonding techniques, the new CBA process allows the CMOS wafer and cell array wafer to be processed independently in parallel and then pieced together, as shown in the models above.
The BiCS 8 3D NAND incorporates 218 layers, compared to 112 layers in BiCS 5 and 162 layers in BiCS 6. The company decided to skip over BiCS 7 (or, rather, it was probably a short-lived generation meant as an internal test vehicle). The generation retains the four-plane charge trap structure of BiCS 6. In its TLC avatar, it is available as a 1 Tbit device. The QLC version is available in two capacities - 1 Tbit and 2 Tbit.
Kioxia also noted that while the number of layers (218) doesn't compare favorably with the latest layer counts from the competition, its lateral scaling / cell shrinkage has enabled it to be competitive in terms of bit density as well as operating speeds (3200 MT/s). For reference, the latest shipping NAND from Micron - the G9 - has 276 layers with a bit density in TLC mode of 21 Gbit/mm2, and operates at up to 3600 MT/s. However, its 232L NAND operates only up to 2400 MT/s and has a bit density of 14.6 Gbit/mm2.
It must be noted that the CBA hybrid bonding process has advantages over the current processes used by other vendors - including Micron's CMOS under array (CuA) and SK hynix's 4D PUC (periphery-under-chip) developed in the late 2010s. It is expected that other NAND vendors will also move eventually to some variant of the hybrid bonding scheme used by Kioxia.
Storage
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