What is the significance of 40gbps if the drive can only transfer at 2700mb/s? isn't only around 7% of 40gbps?

Drive transfer is 2700 MB/s (mega bytes/s), since 1 byte=8 bits so 2700 x 8= 21600 mb/s, which is more than 50% of 40 Gb/s Thunderbolt

Will it work with the new iPhone 15 Pro Max for recording video direct?

Unclear. I’ve ordered an iPhone Pro Max but cannot even find information about whether or not it will work at speed with Thunderbolt 4 cable. Apple only says that it is “compatible” while it mentions specifically other devices like MacBooks that would benefit with top transfer speeds up to 40GBps.

imac 2017 model 10.13.6 - nearly to of memory - will this work on my older iMac? Connects ok to the ports (no idea what they're called)...thanks!

It’s my understanding that Apple’s Thunderbolt ports are backward compatible. So it should work. But you won’t get the full speed this drive is capable of delivering. This is a Thunderbolt 3 design.

Need to back up 500gb of 2012 MacBook Pro; would this be a good choice to do so? (No lightning/usbc port)

It wouldn’t, no. I had no luck using it with a USB-C to USB-A cable, not adapter. I tried several brands/kinds, but none worked. If I recall, TB 1 and 2 don’t offer power output, so you’re out of luck there as well. Though, if you want to spend an unreasonable amount of money on this, plugging the drive into a TB3 or 4 dock and connecting that dock to the laptop using a TB3 ->TB2 adapter may work.

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SANDISK Professional 4TB PRO-G40 SSD - Up to 3000MB/s, Thunderbolt 3 (40Gbps), USB-C (10Gbps), IP68 dust/Water Resistance, External Solid State Drive - SDPS31H-004T-GBCND

SANDISK Professional 4TB PRO-G40 SSD - Up to 3000MB/s, Thunderbolt 3 (40Gbps), USB-C (10Gbps), IP68 dust/Water Resistance, External Solid State Drive - SDPS31H-004T-GBCND

Product ID: 533823399

Details

Brand
SanDisk
Color
Information
Compatible Devices
Mac PC
Connectivity Technology
Thunderbolt
Digital Storage Capacity
4000 GB
Hard Disk Description
Solid State

⚡3000MB/s read speed

🔗Dual Thunderbolt 3 & USB-C compatibility

🛡️IP68 dust & water resistance

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VT345039

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Details

Brand
SanDisk
Color
Information
Compatible Devices
Mac PC

Description

🚀 Power Your Workflow with Speed & Durability — Because Your Work Deserves the Best

RUGGED READY - IP68-rated dust/water resistance plus 4000lb crush & 3m drop protection 🛡️
COOL UNDER PRESSURE - Aluminum core design keeps your drive cool for sustained peak performance ❄️
BLAZING FAST TRANSFERS - Move 50GB in under 60 seconds with up to 3000MB/s read speeds ⚡
UNIVERSAL CONNECTIVITY - Seamlessly switch between Thunderbolt 3 (40Gbps) and USB-C (10Gbps) 🔗
MASSIVE STORAGE ON THE GO - 4TB capacity lets you carry your entire professional portfolio anywhere 💼

The SanDisk Professional 4TB PRO-G40 SSD delivers ultra-fast Thunderbolt 3 speeds up to 3000MB/s read and 2500MB/s write, combined with dual-mode USB-C compatibility. Built for professionals on the move, its IP68 dust and water resistance, 4000lb crush, and 3m drop protection ensure rugged reliability. The aluminum core design maintains cool operation for consistent performance, while 4TB of storage offers ample space for large multimedia and business files. Ideal for demanding workflows, this external SSD balances speed, durability, and portability with a 5-year warranty.

Specifications

ASIN	B0BW6715SV
Additional Features	Dust Resistant, Portable, Water Resistant
Best Sellers Rank	#36 in External Solid State Drives
Brand	SanDisk Professional
Built-In Media	PRO-G40 SSD, Quick Start Guide, Thunderbolt 3 (40Gbps) Cable
Cache Memory Installed Size	4
Color	Information Not Available
Compatible Devices	Mac, PC
Connectivity Technology	Thunderbolt , USB
Customer Reviews	4.0 out of 5 stars 1,076 Reviews
Data Transfer Rate	3000 Megabytes Per Second
Digital Storage Capacity	4000 GB
Enclosure Material	Information Not Available
Form Factor	Portable
Global Trade Identification Number	00619659195991
Hard Disk Description	Solid State Drive
Hard Disk Form Factor	0.5 Inches
Hard Disk Interface	USB 3.0
Hard-Drive Size	4 TB
Hardware Connectivity	Thunderbolt
Installation Type	External Hard Drive
Item Weight	0.27 Pounds
Manufacturer	Sandisk Technologies, Inc.
Media Speed	2500
Mfr Part Number	SDPS31H-004T-GBCND
Model Name	SanDisk Professional PRO-G40 SSD
Model Number	SDPS31H-004T-GBCND
Number of Items	1
Read Speed	3000 Megabytes Per Second
Special Feature	Dust Resistant, Portable, Water Resistant
Specific Uses For Product	Business, Multimedia, Personal
UPC	619659195991
Unit Count	1.0 Count
Warranty Description	5-year limited manufacturer warranty

Reviews

P**T

19.04.2026

S**E

29.07.2025

A**T

13.02.2024

T**N

25.08.2024

C**R

31.10.2025

C**A

30.11.2023

R**S

23.10.2025

D**D

4.12.2025

M**D

14.04.2025

S**C

18.12.2024

G**A

11.02.2026

N**A

13.06.2024

A**R

8.03.2025

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