Posts: 1
Registered: ‎01-20-2020

Extremely slow Read/Write SanDisk 400GB Extreme microSDXC UHS-I/U3 A2 Memory Card

Is this eligible for RMA?


Bought from 3/15/2019.


I have been using this in my Nintendo Switch and only recently noticed some terribly long loading times.


Took it out and ran it through HWTEST and am getting an abyssmal 10MB/s READ !

Tried it with two different USB 3.0 SD Readers. In Windows 7 and 10. Same speeds throughout!


Tested my 256GB Ultra A1 and get 40-60MB/s same Readers, so its not bad readers (albeit those speeds are "low" for 100MB/s rated card)


In case it matters, Formated as exFAT.


Is there anything extra I can try to fix this? I have already backed up all the data to PC (took 1.2 DAYS!) so not afraid to format or send in for RMA if I am still eligible.