read file after restart esp8266 about sdfat

[greiman]

I can't guess what your code does.

[akaJes]

my code based on WebServer.ino standart example
just simple web server and used your library instead embeded based on your old/stable embeded version

this line from example generate result posted above
call stack:
1
2
then call your library
3

[greiman]

I don't debug user code. Provide a simple example with the minimum code that demonstrates the problem.

If possible use SdFat-beta since it will soon replace this version of SdFat.

[akaJes]

after manual disabling USE_MULTI_BLOCK_IO in config, this issue disappeared !
i will try to use https://github.com/greiman/SdFat-beta

[akaJes]

beta has the same issue , after disabling USE_MULTI_BLOCK_IO works properly

[greiman]

I can't reproduce your problem with my tests on a Adafruit HUZZAH ESP8266. I try various transfer sizes and verify the data. I test at 80 and 160 MHz.

Once again, you must submit an example that isolates the problem in a reproducible way.

I won't debug the web-server code since it doesn't check each file operation for errors.

Multi-block I/O can fail if there is any noise on the SPI bus due to wiring problems. This could happen with ESP8266 since yield() is called between SD blocks and noise from wi-fi could cause problems.