Customer reviews from SanDisk
SanDisk - PRO-G40 EXT SSD THUNDERBOLT USB-C 3000MB/S EXFAT 4X6 BOX
Average customer rating
4.3
(4 Reviews)
Rating breakdown 4 reviews
5 Stars
3
4 Stars
0
3 Stars
0
2 Stars
1
1 Star
0
67%of customers recommend this product.
(
2 out of
3)
Customer Reviews for SanDisk - PRO-G40 EXT SSD THUNDERBOLT USB-C 3000MB/S EXFAT 4X6 BOX
Customer Rating
5
4TB G40 SSD = Fast & Super Compact External BackUp
on May 6, 2024
Posted by: cherpitel
Have 15 of these right now, first ones bought at end of June last year.... 14 in pairs, 7 drives duplicated.
Transfer speed is super = a bit less than 100 GB per minute b/w drives via Thunderbolt 3/4 on Mac M1 Studio Ultra.
I do mostly movie stuff right now & will shoot 100-200 GB per day. The SD will say take 20 to 30 minutes to download onto the Mac's 2TB SSD but then only a minute or two to store on each G40.
So far only issue is apparently some dead areas. Explanined: i save all data (foto images & movie 'footage' in duplicate, & try to load drive within 100 to 200 GBs of 4TB limit. There is discrepacy of 8 to 9 GB between the identical files on one or two drive pairs. Other pairs match exactly in 'free' space.
Space: the 60 TBs of drives sit up on end in halves of old iPhone4 boxes taking up less than 1/4th the space of my former pair of WD G-Raid T-bolt 20 TB external hard drives.
Re long term reliability or drive failure: i am impressed by the 5-year warranty BUT beyond having the external storage, most of the drives have been accessed less than 6-7 times so far but a few have been accessed or written to as many as 50 times. Am aware this is probably far far less than average usage.
I would recommend this to a friend!
Written by a customer while visiting SanDisk
Posted by: Swaby
Verified Purchase:Yes
Super fast, rugged, light and more than enough for my everyday needs as a traveling musician and songwriter.
I would recommend this to a friend!
Written by a customer while visiting SanDisk
Customer Rating
2
DISCONECTS AND ALSO REQUIRE EXTERNAL POWER FOR MAC
on December 24, 2025
Posted by: CHILOMADER
THE FACT THAT IT REQUIRES POWERED HUB TO CONNECT TO MACPC IS VERY DSIAPPOINTING. THERE IS NO SPECIAL DRIVER TO REMOVE THATT NEED ALSO. ALSO I HAVE BEEN DISCONNECTED IN THE MIDDLE OF WRITE OR READ OR UNABLE TO FIND DRIVER ALSO. I HAVE BAD EXPERIENCE TO USE IT AS A BAKUP FOR MY LOCAL DRIVE TOO.
No, I would not recommend this to a friend.
Response from SanDiskBy SM OLS, December 26, 2025
We're sorry for the inconvenience caused to you. Kindly note that, since this is a high end device, it is important to ensure the host device can supply sufficient power(5 Volts - 3 Amps) at all times during use. Some systems reduce the USB power which may require a third-party powered USB hub, docking station capable of supplying 5 Volts - 3 Amps or more at all times(https://support-en.sandisk.com/app/answers/detailweb/a_id/34968). If you need further assistance or help with product compatibility, please reach us at: https://support-en.sandisk.com/app/askweb.
Written by a customer while visiting SanDisk
Customer Rating
5
very fine on macbook pro m1 max and mac mini m4
on March 23, 2026
Posted by: georgikam
100% stable after a year of use.
Real performance is 80-90% of advertised max. speed (up to).
Keeps the speed over load time periods.
Never gets really hot - only consumes a fair amount of power, nicely matching the speed.
Small and sturdy.
I only withdraw 1 star for speed, because I know even faster ssd´s, albeit they tend to drain the battery more.
Real performance is 80-90% of advertised max. speed (up to).
Keeps the speed over load time periods.
Never gets really hot - only consumes a fair amount of power, nicely matching the speed.
Small and sturdy.
I only withdraw 1 star for speed, because I know even faster ssd´s, albeit they tend to drain the battery more.
Written by a customer while visiting SanDisk