Western Digital Introduces 4 TB microSDUC, 8 TB SDUC, and 16 TB External SSDs
Western Digital's BiCS8 218-layer 3D NAND is being put to good use in a wide range of client and enterprise platforms, including WD's upcoming Gen 5 client SSDs and 128 TB-class datacenter SSD. On the external storage front, the company demonstrated four different products: for card-based media, 4 TB microSDUC and 8 TB SDUC cards with UHS-I speeds, and on the portable SSD front we had two 16 TB drives. One will be a SanDisk Desk Drive with external power, and the other in the SanDisk Extreme Pro housing with a lanyard opening in the case.
All of these are using BiCS8 QLC NAND, though I did hear booth talk (as I was taking leave) that they were not supposed to divulge the use of QLC in these products. The 4 TB microSDUC and 8 TB SDUC cards are rated for UHS-I speeds. They are being marketed under the SanDisk Ultra branding.
The SanDisk Desk Drive is an external SSD with a 18W power adapter, and it has been in the market for a few months now. Initially launched in capacities up to 8 TB, Western Digital had promised a 16 TB version before the end of the year. It appears that the product is coming to retail quite soon. One aspect to note is that this drive has been using TLC for the SKUs that are currently in the market, so it appears unlikely that the 16 TB version would be QLC. The units (at least up to the 8 TB capacity point) come with two SN850XE drives. Given the recent introduction of the 8 TB SN850X, an 'E' version with tweaked firmware is likely to be present in the 16 TB Desk Drive.
The 16 TB portable SSD in the SanDisk Extreme housing was a technology demonstration. It is definitely the highest capacity bus-powered portable SSD demonstrated by any vendor at any trade show thus far. Given the 16 TB Desk Drive's imminent market introduction, it is just a matter of time before the technology demonstration of the bus-powered version becomes a retail reality.
Storage
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G.Skill Intros Low Latency DDR5 Memory Modules: CL30 at 6400 MT/s
![](https://twitter.com/share?url=https://compbuddey.blogspot.com/2025/04/western-digital-introduces-4-tb_71.html&text=Western Digital Introduces 4 TB microSDUC, 8 TB SDUC, and 16 TB External SSDs <p align="center"><a href="https://www.anandtech.com/show/21521/western-digital-introduces-4-tb-microsduc-8-tb-sduc-and-16-tb-external-ssds"><img src="https://images.anandtech.com/doci/21521/wd-4-8-16-carousel_575px.jpg" alt="" /></a></p><p><p>Western Digital's BiCS8 218-layer 3D NAND is being put to good use in a wide range of client and enterprise platforms, including WD's upcoming <a href="https://www.anandtech.com/show/21508">Gen 5 client SSDs</a> and <a href="https://www.anandtech.com/show/21505">128 TB-class datacenter SSD</a>. On the external storage front, the company demonstrated four different products: for card-based media, 4 TB microSDUC and 8 TB SDUC cards with UHS-I speeds, and on the portable SSD front we had two 16 TB drives. One will be a SanDisk Desk Drive with external power, and the other in the SanDisk Extreme Pro housing with a lanyard opening in the case.</p>
<p align="center"><a href="https://www.anandtech.com/show/21521/western-digital-introduces-4-tb-microsduc-8-tb-sduc-and-16-tb-external-ssds"><img alt="" src="https://images.anandtech.com/doci/21521/4tb-uduc_575px.jpg" /></a></p>
<p>All of these are using BiCS8 QLC NAND, though I did hear booth talk (as I was taking leave) that they were not supposed to divulge the use of QLC in these products. The 4 TB microSDUC and 8 TB SDUC cards are rated for UHS-I speeds. They are being marketed under the SanDisk Ultra branding.</p>
<p align="center"><a href="https://www.anandtech.com/show/21521/western-digital-introduces-4-tb-microsduc-8-tb-sduc-and-16-tb-external-ssds"><img alt="" src="https://images.anandtech.com/doci/21521/8tb-sduc_575px.jpg" /></a></p>
<p>The SanDisk Desk Drive is an external SSD with a 18W power adapter, and it has been in the market for a few months now. Initially launched in capacities up to 8 TB, Western Digital had promised a 16 TB version before the end of the year. It appears that the product is coming to retail quite soon. One aspect to note is that this drive has been using TLC for the SKUs that are currently in the market, so it appears unlikely that the 16 TB version would be QLC. The units (at least up to the 8 TB capacity point) come with two SN850XE drives. Given the recent <a href="https://www.anandtech.com/show/21472/">introduction of the 8 TB SN850X</a>, an 'E' version with tweaked firmware is likely to be present in the 16 TB Desk Drive.</p>
<p align="center"><a href="https://www.anandtech.com/show/21521/western-digital-introduces-4-tb-microsduc-8-tb-sduc-and-16-tb-external-ssds"><img alt="" src="https://images.anandtech.com/doci/21521/16t-externals_575px.jpg" /></a></p>
<p>The 16 TB portable SSD in the SanDisk Extreme housing was a technology demonstration. It is definitely the highest capacity bus-powered portable SSD demonstrated by any vendor at any trade show thus far. Given the 16 TB Desk Drive's imminent market introduction, it is just a matter of time before the technology demonstration of the bus-powered version becomes a retail reality.</p>
</p> Storage){kind=link}
![](https://www.pinterest.com/pin/create/button/?url=https://compbuddey.blogspot.com/2025/04/western-digital-introduces-4-tb_71.html&media=https://lh3.googleusercontent.com/blogger_img_proxy/AEn0k_tUO0DPX6ZL6dGTUxSxd4sVZ0Nz_bsZE-V8wu3biXGG3LIwOa7QbFbl9tnFDnWCB3rwhleS9fvXz6SKF8GbnLev7D3WYMW_Ax3BMyHOE89K8HbXhNT_NA7IqnSVya65h_lhkvAXCs4&description=Western Digital Introduces 4 TB microSDUC, 8 TB SDUC, and 16 TB External SSDs <p align="center"><a href="https://www.anandtech.com/show/21521/western-digital-introduces-4-tb-microsduc-8-tb-sduc-and-16-tb-external-ssds"><img src="https://images.anandtech.com/doci/21521/wd-4-8-16-carousel_575px.jpg" alt="" /></a></p><p><p>Western Digital's BiCS8 218-layer 3D NAND is being put to good use in a wide range of client and enterprise platforms, including WD's upcoming <a href="https://www.anandtech.com/show/21508">Gen 5 client SSDs</a> and <a href="https://www.anandtech.com/show/21505">128 TB-class datacenter SSD</a>. On the external storage front, the company demonstrated four different products: for card-based media, 4 TB microSDUC and 8 TB SDUC cards with UHS-I speeds, and on the portable SSD front we had two 16 TB drives. One will be a SanDisk Desk Drive with external power, and the other in the SanDisk Extreme Pro housing with a lanyard opening in the case.</p>
<p align="center"><a href="https://www.anandtech.com/show/21521/western-digital-introduces-4-tb-microsduc-8-tb-sduc-and-16-tb-external-ssds"><img alt="" src="https://images.anandtech.com/doci/21521/4tb-uduc_575px.jpg" /></a></p>
<p>All of these are using BiCS8 QLC NAND, though I did hear booth talk (as I was taking leave) that they were not supposed to divulge the use of QLC in these products. The 4 TB microSDUC and 8 TB SDUC cards are rated for UHS-I speeds. They are being marketed under the SanDisk Ultra branding.</p>
<p align="center"><a href="https://www.anandtech.com/show/21521/western-digital-introduces-4-tb-microsduc-8-tb-sduc-and-16-tb-external-ssds"><img alt="" src="https://images.anandtech.com/doci/21521/8tb-sduc_575px.jpg" /></a></p>
<p>The SanDisk Desk Drive is an external SSD with a 18W power adapter, and it has been in the market for a few months now. Initially launched in capacities up to 8 TB, Western Digital had promised a 16 TB version before the end of the year. It appears that the product is coming to retail quite soon. One aspect to note is that this drive has been using TLC for the SKUs that are currently in the market, so it appears unlikely that the 16 TB version would be QLC. The units (at least up to the 8 TB capacity point) come with two SN850XE drives. Given the recent <a href="https://www.anandtech.com/show/21472/">introduction of the 8 TB SN850X</a>, an 'E' version with tweaked firmware is likely to be present in the 16 TB Desk Drive.</p>
<p align="center"><a href="https://www.anandtech.com/show/21521/western-digital-introduces-4-tb-microsduc-8-tb-sduc-and-16-tb-external-ssds"><img alt="" src="https://images.anandtech.com/doci/21521/16t-externals_575px.jpg" /></a></p>
<p>The 16 TB portable SSD in the SanDisk Extreme housing was a technology demonstration. It is definitely the highest capacity bus-powered portable SSD demonstrated by any vendor at any trade show thus far. Given the 16 TB Desk Drive's imminent market introduction, it is just a matter of time before the technology demonstration of the bus-powered version becomes a retail reality.</p>
</p> Storage){kind=link}
![](https://web.whatsapp.com/send?text=Western Digital Introduces 4 TB microSDUC, 8 TB SDUC, and 16 TB External SSDs <p align="center"><a href="https://www.anandtech.com/show/21521/western-digital-introduces-4-tb-microsduc-8-tb-sduc-and-16-tb-external-ssds"><img src="https://images.anandtech.com/doci/21521/wd-4-8-16-carousel_575px.jpg" alt="" /></a></p><p><p>Western Digital's BiCS8 218-layer 3D NAND is being put to good use in a wide range of client and enterprise platforms, including WD's upcoming <a href="https://www.anandtech.com/show/21508">Gen 5 client SSDs</a> and <a href="https://www.anandtech.com/show/21505">128 TB-class datacenter SSD</a>. On the external storage front, the company demonstrated four different products: for card-based media, 4 TB microSDUC and 8 TB SDUC cards with UHS-I speeds, and on the portable SSD front we had two 16 TB drives. One will be a SanDisk Desk Drive with external power, and the other in the SanDisk Extreme Pro housing with a lanyard opening in the case.</p>
<p align="center"><a href="https://www.anandtech.com/show/21521/western-digital-introduces-4-tb-microsduc-8-tb-sduc-and-16-tb-external-ssds"><img alt="" src="https://images.anandtech.com/doci/21521/4tb-uduc_575px.jpg" /></a></p>
<p>All of these are using BiCS8 QLC NAND, though I did hear booth talk (as I was taking leave) that they were not supposed to divulge the use of QLC in these products. The 4 TB microSDUC and 8 TB SDUC cards are rated for UHS-I speeds. They are being marketed under the SanDisk Ultra branding.</p>
<p align="center"><a href="https://www.anandtech.com/show/21521/western-digital-introduces-4-tb-microsduc-8-tb-sduc-and-16-tb-external-ssds"><img alt="" src="https://images.anandtech.com/doci/21521/8tb-sduc_575px.jpg" /></a></p>
<p>The SanDisk Desk Drive is an external SSD with a 18W power adapter, and it has been in the market for a few months now. Initially launched in capacities up to 8 TB, Western Digital had promised a 16 TB version before the end of the year. It appears that the product is coming to retail quite soon. One aspect to note is that this drive has been using TLC for the SKUs that are currently in the market, so it appears unlikely that the 16 TB version would be QLC. The units (at least up to the 8 TB capacity point) come with two SN850XE drives. Given the recent <a href="https://www.anandtech.com/show/21472/">introduction of the 8 TB SN850X</a>, an 'E' version with tweaked firmware is likely to be present in the 16 TB Desk Drive.</p>
<p align="center"><a href="https://www.anandtech.com/show/21521/western-digital-introduces-4-tb-microsduc-8-tb-sduc-and-16-tb-external-ssds"><img alt="" src="https://images.anandtech.com/doci/21521/16t-externals_575px.jpg" /></a></p>
<p>The 16 TB portable SSD in the SanDisk Extreme housing was a technology demonstration. It is definitely the highest capacity bus-powered portable SSD demonstrated by any vendor at any trade show thus far. Given the 16 TB Desk Drive's imminent market introduction, it is just a matter of time before the technology demonstration of the bus-powered version becomes a retail reality.</p>
</p> Storage | https://compbuddey.blogspot.com/2025/04/western-digital-introduces-4-tb_71.html){kind=link}
![](mailto:?subject=Western Digital Introduces 4 TB microSDUC, 8 TB SDUC, and 16 TB External SSDs <p align="center"><a href="https://www.anandtech.com/show/21521/western-digital-introduces-4-tb-microsduc-8-tb-sduc-and-16-tb-external-ssds"><img src="https://images.anandtech.com/doci/21521/wd-4-8-16-carousel_575px.jpg" alt="" /></a></p><p><p>Western Digital's BiCS8 218-layer 3D NAND is being put to good use in a wide range of client and enterprise platforms, including WD's upcoming <a href="https://www.anandtech.com/show/21508">Gen 5 client SSDs</a> and <a href="https://www.anandtech.com/show/21505">128 TB-class datacenter SSD</a>. On the external storage front, the company demonstrated four different products: for card-based media, 4 TB microSDUC and 8 TB SDUC cards with UHS-I speeds, and on the portable SSD front we had two 16 TB drives. One will be a SanDisk Desk Drive with external power, and the other in the SanDisk Extreme Pro housing with a lanyard opening in the case.</p>
<p align="center"><a href="https://www.anandtech.com/show/21521/western-digital-introduces-4-tb-microsduc-8-tb-sduc-and-16-tb-external-ssds"><img alt="" src="https://images.anandtech.com/doci/21521/4tb-uduc_575px.jpg" /></a></p>
<p>All of these are using BiCS8 QLC NAND, though I did hear booth talk (as I was taking leave) that they were not supposed to divulge the use of QLC in these products. The 4 TB microSDUC and 8 TB SDUC cards are rated for UHS-I speeds. They are being marketed under the SanDisk Ultra branding.</p>
<p align="center"><a href="https://www.anandtech.com/show/21521/western-digital-introduces-4-tb-microsduc-8-tb-sduc-and-16-tb-external-ssds"><img alt="" src="https://images.anandtech.com/doci/21521/8tb-sduc_575px.jpg" /></a></p>
<p>The SanDisk Desk Drive is an external SSD with a 18W power adapter, and it has been in the market for a few months now. Initially launched in capacities up to 8 TB, Western Digital had promised a 16 TB version before the end of the year. It appears that the product is coming to retail quite soon. One aspect to note is that this drive has been using TLC for the SKUs that are currently in the market, so it appears unlikely that the 16 TB version would be QLC. The units (at least up to the 8 TB capacity point) come with two SN850XE drives. Given the recent <a href="https://www.anandtech.com/show/21472/">introduction of the 8 TB SN850X</a>, an 'E' version with tweaked firmware is likely to be present in the 16 TB Desk Drive.</p>
<p align="center"><a href="https://www.anandtech.com/show/21521/western-digital-introduces-4-tb-microsduc-8-tb-sduc-and-16-tb-external-ssds"><img alt="" src="https://images.anandtech.com/doci/21521/16t-externals_575px.jpg" /></a></p>
<p>The 16 TB portable SSD in the SanDisk Extreme housing was a technology demonstration. It is definitely the highest capacity bus-powered portable SSD demonstrated by any vendor at any trade show thus far. Given the 16 TB Desk Drive's imminent market introduction, it is just a matter of time before the technology demonstration of the bus-powered version becomes a retail reality.</p>
</p> Storage&body=https://compbuddey.blogspot.com/2025/04/western-digital-introduces-4-tb_71.html){kind=link}
G.Skill on Tuesday introduced its ultra-low-latency DDR5-6400 memory modules that feature a CAS latency of 30 clocks, which appears to be the industry's most aggressive timings yet for DDR5-6400 sticks. The modules will be available for both AMD and Intel CPU-based systems.
With every new generation of DDR memory comes an increase in data transfer rates and an extension of relative latencies. While for the vast majority of applications, the increased bandwidth offsets the performance impact of higher timings, there are applications that favor low latencies. However, shrinking latencies is sometimes harder than increasing data transfer rates, which is why low-latency modules are rare.
Nonetheless, G.Skill has apparently managed to cherry-pick enough DDR5 memory chips and build appropriate printed circuit boards to produce DDR5-6400 modules with CL30 timings, which are substantially lower than the CL46 timings recommended by JEDEC for this speed bin. This means that while JEDEC-standard modules have an absolute latency of 14.375 ns, G.Skill's modules can boast a latency of just 9.375 ns – an approximately 35% decrease.
G.Skill's DDR5-6400 CL30 39-39-102 modules have a capacity of 16 GB and will be available in 32 GB dual-channel kits, though the company does not disclose voltages, which are likely considerably higher than those standardized by JEDEC.
The company plans to make its DDR5-6400 modules available both for AMD systems with EXPO profiles (Trident Z5 Neo RGB and Trident Z5 Royal Neo) and for Intel-powered PCs with XMP 3.0 profiles (Trident Z5 RGB and Trident Z5 Royal). For AMD AM5 systems that have a practical limitation of 6000 MT/s – 6400 MT/s for DDR5 memory (as this is roughly as fast as AMD's Infinity Fabric can operate at with a 1:1 ratio), the new modules will be particularly beneficial for AMD's Ryzen 7000 and Ryzen 9000-series processors.
G.Skill notes that since its modules are non-standard, they will not work with all systems but will operate on high-end motherboards with properly cooled CPUs.
The new ultra-low-latency memory kits will be available worldwide from G.Skill's partners starting in late August 2024. The company did not disclose the pricing of these modules, but since we are talking about premium products that boast unique specifications, they are likely to be priced accordingly.
Memory
Microchip Demonstrates Flashtec 5016 Enterprise SSD Controller
Microchip recently announced the availability of their second PCIe Gen 5 enterprise SSD controller - the Flashtec 5016. Like the 4016, this is also a 16-channel controller, but there are some key updates:
- PCIe 5.0 lane organization: Operation in x4 or dual independent x2 / x2 mode in the 5016, compared to the x8, or x4, or dual independent x4 / x2 mode in the 4016.
- DRAM support: Four ranks of DDR5-5200 in the 5016, compared to two ranks of DDR4-3200 in the 4016.
- Extended NAND support: 2400 MT/s NAND in the 4016, compared to the 3200 MT/s NAND support in the 5016.
- Performance improvements: The 5016 is capable of delivering 3.5M+ random read IOPS compared to the 3M+ of the 4016.
Microchip's enterprise SSD controllers provide a high level of flexibility to SSD vendors by providing them with significant horsepower and accelerators. The 5016 includes Cortex-A53 cores for SSD vendors to run custom applications relevant to SSD management. However, compared to the Gen4 controllers, there are two additional cores in the CPU cluster. The DRAM subsystem includes ECC support (both out-of-band and inline, as desired by the SSD vendor).
At FMS 2024, the company demonstrated an application of the neural network engines embedded in the Gen5 controllers. Controllers usually employ a 'read-retry' operation with altered read-out voltages for flash reads that do not complete successfully. Microchip implemented a machine learning approach to determine the read-out voltage based on the health history of the NAND block using the NN engines in the controller. This approach delivers tangible benefits for read latency and power consumption (thanks to a smaller number of errors on the first read).
The 4016 and 5016 come with a single-chip root of trust implementation for hardware security. A secure boot process with dual-signature authentication ensures that the controller firmware is not maliciously altered in the field. The company also brought out the advantages of their controller's implementation of SR-IOV, flexible data placement, and zoned namespaces along with their 'credit engine' scheme for multi-tenant cloud workloads. These aspects were also brought out in other demonstrations.
Microchip's press release included quotes from the usual NAND vendors - Solidigm, Kioxia, and Micron. On the customer front, Longsys has been using Flashtec controllers in their enterprise offerings along with YMTC NAND. It is likely that this collaboration will continue further using the new 5016 controller.
Storage
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