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CiNcH83 / bravia_atv2

BRAVIA Android TV Knowledge Base
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Bad R/W performance of USB flash pen drives set up as device storage #29

Closed CiNcH83 closed 5 years ago

CiNcH83 commented 5 years ago

I measured speed of an ADATA S102 Pro 32GB USB flash pen drive (rated at 100MB/s READ and 50MB/s WRITE) using Disk Speed / Performance Test.

Formatted as removable storage (FAT32): READ: 101MB/s WRITE: 30MB/s

After formatting the flash pen drive as device storage, speed decreased dramatically.

Formatted as device storage: READ: 49MB/s WRITE: 7MB/s

I wonder what the bottleneck is!? Data is encrypted/decrypted in case of device storage. However both, the internal flash and a USB3.0 HDD formatted as device storage yield much higher speeds. Especially write performance suffers a lot when using a flash pen drive.

Internal flash memory: READ: 127MB/s WRITE: 26MB/s

CiNcH83 commented 5 years ago

Rated speed often does not give any indication about whether a thumb drive is suitable as extended device storage or not.

I now tried a Samsung BAR Plus 128GB (rated at 300MB/s READ and 50MB/s WRITE) which used to be on nVIDIA's recommendation list...

Formatted as removable storage (FAT32): READ: 139MB/s WRITE: 44MB/s

Formatted as device storage: READ: 52MB/s WRITE: 33MB/s

A READ speed of ~50MB/s seems to be the maximum for adoptable storage. This could indeed be improved as it is only half of what the internal flash achieves. WRITE speeds above 30MB/s are fine.