Samsung Portable SSD T7 Shield 4TB Review: IP65 PSSD Gets a Capacity Upgrade

Samsung has been enjoying market success with their lineup of portable SSDs, starting with the T1 back in 2015. The company has been regularly updating their PSSD lineup with the evolution of different high-speed interfaces as well as NAND flash technology.

In early 2022, the company launched the Portable SSD T7 Shield, a follow-up to the Portable SSD T7 (Touch) introduced in early 2020. Introduced in models with capacities up to 2TB, the ruggedness / IP65 rating of the T7 Shield was advertised as a selling point over the regular Portable SSD T7 and T7 Touch. The company launched a 4TB version in this lineup in mid-January for the EU market. Samsung is officially bringing over the new capacity SKU to the North American market today. The review below provides a comprehensive look at the performance and value proposition of the Portable SSD T7 Shield 4TB.

Introduction and Product Impressions

External bus-powered storage devices capable of 1GBps+ performance have become entry-level offerings in the market today. Rapid advancements in flash technology (including the advent of 3D NAND and NVMe) as well as faster host interfaces (such as Thunderbolt 3 and USB 3.2 Gen 2+) have been key enablers. Broadly speaking, there are five distinct performance levels in this market:

• 2GBps+ drives with Thunderbolt 3 or USB4, using NVMe SSDs
• 2GBps drives with USB 3.2 Gen 2x2, using NVMe SSDs or direct USB flash drive (UFD) controllers
• 1GBps drives with USB 3.2 Gen 2, using NVMe SSDs or direct UFD controllers
• 500MBps drives with USB 3.2 Gen 1 (or, Gen 2, in some cases), using SATA SSDs
• Sub-400MBps drives with USB 3.2 Gen 1, using UFD controllers

The Samsung Portable SSD T7 Shield we are looking at today belongs to the third category in the above list, utilizing a NVMe SSD behind an ASMedia ASM2362 bridge chip. The 4TB version we are looking at today is essentially the same as the 2TB version we reviewed last year, with the only differences being in the external elastomer covering's color and the number of flash packages on the board. As a reminder, the T7 Shield has an industrial design that can protect the drive against dust ingress and splashes of water (IP65), as well as lend it an element of ruggedness.

Samsung includes two separate cables - one USB Type-C to Type-A, and another Type-C to Type-C of approximately the same length. Disassembling the unit is fairly trivial after taking out the four screws hidden under the product label stickers on either side, and removing the elastomer covering. This reveals an aluminum metal enclosure. The plastic tray holding the actual PSSD board can then be slid out after the removal of the plastic piece opposite the connector end. Both plastic end pieces have grommets around their periphery to ensure a good seal and contribute to the IP65 rating. The main board is held on to the plastic tray by four smaller screws. The connector on the main board has a red-colored sealing band to ensure that it doesn't become an ingress point for external material. The gallery below includes pictures from the teardown process.

Similar to the 2TB version, the 4TB version is also single-sided (but includes a thermal pad on the empty side). The SSD controller is the Pablo S4LR033 (also used in the Samsung SSD 980), and the ASMedia ASM2362 bridge chip is right next to it. The SSD subsystem in the PSSD T7 Shield is a DRAM-less one, and is pretty much the same as that of the T7 Touch - except for the flash packages. The four flash chips on board have the K9DVGB8J1B tag (against the K9DVGY8J5A in the PSSD T7 Touch). This part number decodes as: TLC, 6th gen V-NAND (128L / 136T), 512Gbit per die, 16 dies, 1TB for the whole package. This is the same NAND package used in Samsung 870 EVO SATA SSD.

Internal PSSD Board - 2TB Version



Internal PSSD Board - 4TB Version

The review compares the Samsung Portable SSD T7 Shield 4TB against the following:

• Crucial X6 4TB
• SanDisk Extreme PRO v2 4TB
• Samsung T7 Shield 2TB
• Samsung T7 Touch 1TB

It must be noted that there are no apples-to-apples comparison in the above list. The Crucial X6 uses the Phison U17, a native flash controller. However, like the T7 Shield, it is also a USB 3.2 Gen 2 PSSD. The SanDisk Extreme PRO v2 in the list is at the same capacity point as the T7 Shield, but comes with a USB 3.2 Gen 2x2 upstream interface. The two other Samsung PSSDs are representative of the same PSSD family at different capacity points.

A quick overview of the internal capabilities of the storage devices is given by CrystalDiskInfo. The Samsung PSSD T7 Shield supports full S.M.A.R.T passthrough, along with TRIM to ensure consistent performance for the drive over its lifetime.

S.M.A.R.T Passthrough - CrystalDiskInfo
Samsung T7 Shield 4TBCrucial X6 4TBSanDisk Extreme PRO v2 4TBSamsung T7 Shield 2TBSamsung T7 Touch 1TB	Crucial X6 4TBSanDisk Extreme PRO v2 4TBSamsung T7 Shield 2TBSamsung T7 Touch 1TBSamsung T7 Shield 4TB

The table below presents a comparative view of the specifications of the different storage bridges presented in this review.

Prior to looking at the benchmark numbers, power consumption, and thermal solution effectiveness, a description of the testbed setup and evaluation methodology is provided.

Testbed Setup and Evaluation Methodology

Direct-attached storage devices (including portable SSDs) are evaluated using the Quartz Canyon NUC (essentially, the Xeon / ECC version of the Ghost Canyon NUC) configured with 2x 16GB DDR4-2667 ECC SODIMMs and a PCIe 3.0 x4 NVMe SSD - the IM2P33E8 1TB from ADATA.

The most attractive aspect of the Quartz Canyon NUC is the presence of two PCIe slots (electrically, x16 and x4) for add-in cards. In the absence of a discrete GPU - for which there is no need in a DAS testbed - both slots are available. In fact, we also added a spare SanDisk Extreme PRO M.2 NVMe SSD to the CPU direct-attached M.2 22110 slot in the baseboard in order to avoid DMI bottlenecks when evaluating Thunderbolt 3 devices. This still allows for two add-in cards operating at x8 (x16 electrical) and x4 (x4 electrical). Since the Quartz Canyon NUC doesn't have a native USB 3.2 Gen 2x2 port, Silverstone's SST-ECU06 add-in card was installed in the x4 slot. All non-Thunderbolt devices are tested using the Type-C port enabled by the SST-ECU06.

The specifications of the testbed are summarized in the table below:

The testbed hardware is only one segment of the evaluation. Over the last few years, the typical direct-attached storage workloads for memory cards have also evolved. High bit-rate 4K videos at 60fps have become quite common, and 8K videos are starting to make an appearance. Game install sizes have also grown steadily even in portable game consoles, thanks to high resolution textures and artwork. Keeping these in mind, our evaluation scheme for direct-attached storage devices involves multiple workloads which are described in detail in the corresponding sections.

• Synthetic workloads using CrystalDiskMark and ATTO
• Real-world access traces using PCMark 10's storage benchmark
• Custom robocopy workloads reflective of typical DAS usage
• Sequential write stress test

In the next section, we have an overview of the performance of the Samsung Portable SSD T7 Shield in these benchmarks. Prior to providing concluding remarks, we have some observations on the PSSD's power consumption numbers and thermal solution also.