You can't compare the performance or thermal characteristics of these portable SSDs without using the default enclosures and bridge chips. Thus, comparing just the underlying storage alone. Seanwebster said:At that point you wouldn't be testing the actual portable SSDs as they are, you would just be testing the performance of the internal SSDs in that one enclosure. SanDisk says the simple BiCS4 architecture helps to drive down cost when scaling up the charge trap flash design. Due to its simplicity, this flash is not quite as complicated to manufacture as competing flash that comes with quad-plane designs and complex PUA, CUA, or COP designs. All interface with the controller at Toggle DDR4 speeds of up to 800MTps, providing very bursty performance even with a dual-plane design. Our 2TB sample features two NAND packages packed with sixteen 512Gb dies each, for 32 in total. This is an improvement over the SN750, and the SN730 also comes with WD’s 96L TLC NAND flash. SanDisk outfitted the internal SSD with a DDR4 DRAM chip to hold the flash translation layer (FTL) mapping tables. The SN730 also has robust multi-gear LDPC ECC (error correction) with RAID-like XOR protection, including full multi-page recovery for higher endurance and faster performance. The SN730 also comes with TCG Opal AES 256-bit encryption, which is required to enable the password protection feature on the new portable SSD. The PC SN730 comes with an SSD controller that is similar to the WD Black SN750, but uses different flash. The SN730E client SSD features a robust, high-end eight-channel multi-core DRAM-based controller architecture. The SanDisk Extreme Pro uses the PC SN730E for the internal SSD, not the WD Black SN750E (E for external firmware) that we expected. The controller also supports Trim to keep performance predictable. Not only does it maintain a speedy 20 Gbps link while connected to a PCIe 3.0 x4 SSD, but it also features link power management to reduce idle power consumption. A new ASMedia ASM2364 bridge controller communicates with the host at faster speeds because it has twice the PCIe lane count as the ASM2362, which means twice the throughput. The new SanDisk Extreme Pro v2 comes with some changes under the hood, too. That, along with the smooth rounded silicone-coated edges, conveys an apple-esque quality. At 85 grams, the Extreme Pro has a solid and weighted feel to it. The Extreme Pro is IP55 water and dust resistant and rated to withstand a two-meter drop, though we feel that is a very conservative rating. Like the previous-gen model, it still lacks a power light indicator. SanDisk’s Extreme Pro is faster than the previous-gen model but retains the greyish-blue hue and orange carabiner loop integrated into the forged aluminum construction, just like its predecessor. This is common for a high-performance SSD, and the Extreme Pro's performance doesn't degrade too much. The Extreme Pro features an SLC write cache that absorbs most inbound write data, but the cache will fill, and performance will degrade during long transfers. These performance figures are finite, however. SanDisk rates the Extreme Pro to deliver up to 2,000MBps in both read and write workloads when used with a 20 Gbps host device. At $300 for the 1TB model and $500 for the 2TB, the drives launch at premium prices but come backed with lengthy five-year warranties. The new Extreme Pro v2 comes in capacities of 1TB and 2TB, but only the 2TB model is available at launch. SanDisk gave the product line a slight nip and tuck, though, by cutting out the 500GB model. IP55 water-dust resistant1, 2-meter drop protection
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