Remote I/O error from f3probe and f3write

[awik32]

f3probe reports an error immediately upon starting it:

# f3probe /dev/sdc
F3 probe 8.0
Copyright (C) 2010 Digirati Internet LTDA.
This is free software; see the source for copying conditions.

WARNING: Probing normally takes from a few seconds to 15 minutes, but
         it can take longer. Please be patient.

f3probe: read_all(): unexpected error code from read(2) = 121: Remote I/O error

f3write reports the error after writing about 1480 files:

$ sudo f3write /mnt/usb
F3 write 8.0
Copyright (C) 2010 Digirati Internet LTDA.
This is free software; see the source for copying conditions.

Free space: 11.44 TB
Creating file 1.h2w ... OK!                             
Creating file 2.h2w ... OK!                             
Creating file 3.h2w ... OK!                             
Creating file 4.h2w ... OK!                             
....
Creating file 1476.h2w ... OK!                              
Creating file 1477.h2w ... OK!                              
Creating file 1478.h2w ... OK!                              
Creating file 1479.h2w ... Write failure: Remote I/O error  
Creating file 1480.h2w ... 12.62% -- 12.26 MB/s -- 241:10:57f3write: libflow.h:89: get_rem_chunk_size: Assertion `fw->blocks_per_delay > fw->processed_blocks' failed.
Aborted

Regards, Albert.