5.0 out of 5 stars High-Speed Performance with Notable Reliability Concerns

S.P. · July 29, 2025

I recently purchased the SanDisk Professional 4TB PRO-G40 SSD, enticed by its impressive specifications and rugged design. Initially, the drive delivered exceptional performance, boasting read speeds up to 3000MB/s and write speeds up to 2500MB/s when connected via Thunderbolt 3 . The aluminum core and IP68 rating for dust and water resistance gave me confidence in its durability, making it suitable for on-the-go professionals.However, after a few weeks of use, I encountered several reliability issues. The drive began to intermittently disconnect, requiring multiple reconnections before it would appear in Finder on my MacBook Pro. Additionally, I experienced problems with Spotlight indexing and occasional system freezes upon ejecting the drive .Despite these challenges, the drive's speed and ruggedness remain appealing. If you're considering this SSD, be aware of potential compatibility and reliability issues, especially with macOS systems. It's advisable to ensure your system's USB-C ports provide sufficient power and to use high-quality cables to minimize connection problems.

5.0 out of 5 stars Fast drive, works great with Thunderbolt 4 hub. Flaky cable sometimes connects at USB 3.1 speeds.

C. · November 30, 2023

Finally a portable SSD with Thunderbolt speeds! It really is three times faster than the USB 3.2 Gen 2 drive from SanDisk I bought just last year (and, for Mac, also three times faster than USB 3.2 Gen 2x2 drives since the Thunderbolt ports on Mac won't use the second lane at all).At times, plugging it directly into a Thunderbolt 4 port on an M2 Mac mini with the provided cable, it connected using USB 3.1 rather than Thunderbolt. I verified this by looking at the USB and Thunderbolt buses using System Report; also BlackMagic disk speed tests were much slower when this happened (700-800MB/s rather than 2400ish). I'm not sure if that flakiness is caused by the drive, the Mac mini, or the cable—but I'd guess it's the cable. Other times, it connected to the Thunderbolt bus as expected.Mostly I will have this connected to a Thunderbolt 4 hub that nets me two more Thunderbolt 4 ports. I've found that this setup, with otherwise base M2 but upgraded to 24GB RAM, plus the external TB4 ports and storage, is very cost effective for my needs. Note that there is no decrease in speeds having it connected to the hub vs. directly to the Mac.Update 1: Because this SSD (the 4TB version) is **both 50% faster and 15 times larger** than the internal SSD on my 256GB M2 Mac Mini, I have turned it into a bootable drive and am running macOS from it. No complaints! Upgrading the Mac Mini at time of purchase to 2TB (half the space!) internally would have cost a whopping $800 extra with Apple's pricing, and I'd have less space. Not to mention it's impossible to upgrade the internal storage after the fact. Setting up as a bootable drive was simple and painless for me. More benefits of the big, fast bootable drive include plenty of space for memory swapping at higher speeds than the internal SSD if I run out of RAM, plus being able to keep large cloud storage drives fully available offline (Apple's FileProvider forces many of them to live in a particular location on the same volume macOS is installed on, which was too small for them until I moved to this drive).Update 2: If you're looking for a Thunderbolt drive that's a lot faster than this, don't bother looking. Theoretical max data transfer speeds over Thunderbolt 3/4 are limited to something like 22 Gbps (maybe 24 Gbps for Thunderbolt 4?) which translates to 2750MB/sec for Thunderbolt 3. The rest of the 40 Gbps bandwidth of Thunderbolt is reserved for other things. With this drive, I've gotten around 2480MB/sec read and 2400MB/sec write in BlackMagic disk speed benchmarks, which is close enough to top speed that I've stopped looking at, say, external Thunderbolt SSD enclosures + NVMe SSD sticks to try to get faster speeds than this.

1.0 out of 5 stars DO NOT BUY: Constantly loses connection, no customer support

a. · February 13, 2024

I bought this to use as a backup for my computer, as well as for music production. The thing is great when it works - it’s hella fast, and so freaking tiny. Unfortunately, the device is constantly, spontaneously “improperly ejected” from my computer. I get constant notifications/warnings. I’m using the provided cable. It should just work. It’s less than a month old. I reached out to customer support a week ago and haven’t heard anything yet - not even a “thanks for reaching out” email. It might be worth it to check out their competition. This thing is too expensive for this kind of performance and (lack of) customer service, and you’re probably buying this because you need something reliable that actually does the thing it says it should do.Update: It’s been two months and I still am having constant issues with the drive spontaneously disconnecting. I still have not heard back from customer service after reaching out to the emails provided on their website. I also just wanted to say that I’ve had the overheating issues others have mentioned when it does work. Sometimes it seems to decide to just stop working because it gets so hot (which is yet another way I lose work thanks to this thing). I’m so upset that I spent so much money on this and have lost hours/days of work because of the problems this thing has. I’m in the process of trying to jerry-rig a solution - I just spent ~$50 on different kinds of tapes and cables to try to see if that will solve the problems. I cannot caution against this thing enough. Save yourself the headaches and heartaches of losing valuable data and go with the Samsung version. It may cost more up front, but you’ll be saving yourself in more ways than you know.Update 4 months later: Still no word from “customer support”. None of the cables (or tape) I purchased to try instead of the included one solves the issue, which is how I know without a shadow of doubt it’s an issue with this joke of a product and not my computer. This has been the worst purchase I’ve made in probably a decade. I’m going to end up buying the Samsung one, so I’m just out $400 because I made the mistake of not purchasing this with a credit card that might have offered more purchase protection. I still cannot caution against this thing enough. Do not make my mistake. Spend your hard-earned money on something that’s actually worth what you’re spending.Update 1.5years later: Just wanted to come back and state again how much I hate this hard drive after looking at other hard drives again and getting super sad and annoyed that I ever bought this one to begin with. It remains probably the worst purchase I've made for as long as I can remember. Please do not make the same mistake me and others made. It's not a cheap one to make. I literally will never purchase another sandisk product again because of this experience.

وحش جدا جدا

M.s. · April 14, 2025

سيء جدا .. اشتريته من شهر ودلوقتى بيعلق ومش بيشتغل وبيهنج الجهاز كله وحاجه مقرفه والبايع عمال بينزل السعر ويرفعه علي مزاجه لا انصح به تماما

Trop cher

S.L.R.M. · December 18, 2024

Sympa mais pas le meilleur rapport qualité-prix

Vraiment impressionnant

A.C. · March 8, 2025

J'ai été vraiment impressionné de la grosseur. Ça tient dans une poche.Je suis encore en train de vérifier si ça va fonctionner avec mon ancien ordinateur de 2014. Je l'ai branché sur le port usb c de mon powered hub. Vu que ça prend beaucoup plus de puissance que le port usb a. J'attends un adapteur usb a à usb c.9 Mars 2025, ça fonctionne et c'est extrêmement rapide.J'utilise beaucoup de bibliothèques de sons. Alors c'est très pesant. Mon ancien disque dur n'était plus capable.Ça a été une histoire. Mais c'est fait. L'ordinateur est encore très bon. Je n'étais pas intéressé à le changer.La seule chose que je regrette c'est de ne pas avoir eu la possibilité d'acheter un de 8 terabytes. Le maximum était de 4 To.Aujourd'hui je l'utilise avec mon Microsoft Surface. C'est génial. Il a déjà un ssd. Mais c'est pas assez pour tout ce que j'ai besoin.

Funktioniert 1A am Mac, Voraussetzung: das richtige Thunderbolt Kabel

H.F. · August 16, 2024

Interner SSD Festplattenspeicher bei Apple kostet das drei- bis vierfache, daher sind bei mir weiterhin externe SSD im Einsatz. Diese müssen schnell sein, bestenfalls so schnell wie die interne Mac SSD, um damit aufwendige Video- und Fotobearbeitungen durchführen zu können.Meine erste schnelle externe Thunderbolt 3 SSD, war eine Samsung MU-PB2T0B/EU Portable SSD X5, in 2021. Diese sehr gute SSD ist bei mir auch weiterhin im täglichen Dauereinsatz an einem MacBook M Pro..Da Samsung mit der T7 und T9, aus mir unerklärlichen Gründen, keine für Mac geeigneten schnellen Thunderbolt SSD mehr anbietet, musste für den MacMini M2 Pro eine andere schnelle Thunderbolt SSD her.Und die SanDisk ist eine der ganz ganz wenigen externen Thunderbolt SSD, welche auch am Mac Thunderbolt Anschluss die beworbene Geschwindigkeit erzielt, da diese SSD eine echte Thunderbolt 3 Schnittstelle hat. Was sich am Ende auch im recht hohen Preis ausdrückt im Vergleich zu Platten die zwar mit Thunderbolt werben, aber nur eine lausige USB-C Schnittstelle verbaut haben.Aber Achtung, mit dem von SanDisk beigefügten minderwertigen Thunderbolt Kabel wie mit den meisten der erhältlichen günstigen Thunderbolt Kabel funktioniert die Platte nicht richtig und ist auch langsam.Es muss ein hochwertiges echtes Thunderbolt 3 oder 4 Kabel sein, bei mir für 60 € das Apple Thunderbolt 4 Pro Kabel. ​​​Der Preis für dieses Kabel ist nicht überzogen. Vergleichstests haben belegt, dass die Wettbewerber zwar als Thunderbolt deklarierte Kabel zum halben Preis bieten, die aber überhaupt nicht dem Intel Standard entsprechen. Da werden nur 6, 8 oder 12 der 24 PINS belegt, die PINS werden zudem überbrückt und am Chip und an der Abschirmung wird ebenso gespart. Am Ende erreicht man mit diesen Fake Kabeln nur eines, Verbindungsabbrüche, Geschwindigkeitseinbrüche und Systemabstürze.Diese Platte hier, mit dem richtigem Thunderbolt Kabel am Mac Thunderbolt Anschluss liefert was versprochen wird, nämlich fast die gleich hohen Geschwindigkeiten wie interne SSD und dabei wird sie auch nicht übermäßig heiß, was ich ausgiebig getestet habe. Beim Schreiben von 1,5 TB am Stück auf die Platte erreicht die Platte zudem dauerhaft etwa 2950 MB/s.Normalerweise müsste man 3 Sterne abziehen, dafür das SanDisk weiterhin nur dieses Billig Kabel beifügt. Ehrlicher wäre, wenn Sie gar kein Kabel beilegten oder aber nur als Option zum entsprechenden Preis ein hochwertiges Kabel mit anbieten würden, wo man aber sicher ist, dass es auch funktioniert.Ich gebe dennoch 5 Sterne für diese sehr schnelle, sehr kompakte und reisetaugliche 4 TB SSD.

Wow

A. · March 27, 2024

Plus petit que je ne le pensais, mais d’une efficacité redoutable ( copie de gros fichiers 30 à 40 Go en quelques secondes) . Très belle prise en main.