https://devzone.nordicsemi.com/f/nordic-q-a/72661/use-usbd_msc-eample-libuarte-to-create-xls-file-the-file-was-damaged-sometimes-when-open-it-on-pcHi, Dear Nordic &amp; All: I use usbd_msc example to generate .xls file, and write content in it, sometimes I write successfully, and can open it right on PC with WPS， but sometimes I generate the same .xls file (my application in nrf52840 DK(sdk 17.0en-USTelligent Community 13Sat, 13 Mar 2021 07:31:00 GMThttps://devzone.nordicsemi.com/thread/299581?ContentTypeID=1Sat, 13 Mar 2021 07:31:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a72f21ff-b6fc-418e-8cf2-fecbd130083bChris_<p>Hi, Einar:</p> <p>Thanks for your reply,</p> <p>I change&nbsp;NRF_BLOCK_DEV_QSPI_FLAG_CACHE_WRITEBACK to 0, and it works well, the file wasn&#39;t damaged any more&nbsp; even&nbsp; I operate it very&nbsp;<span>frequently；</span></p> <p>Thanks again !</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/299493?ContentTypeID=1Fri, 12 Mar 2021 13:52:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6308c2e5-a073-4b88-a946-f3fb04622ac4Einar Thorsrud<p>Hi,</p> <p>There are a few known issues with known workarounds for the usb msc example.</p> <p>Can you try to apply the fixes from <a href="https://devzone.nordicsemi.com/f/nordic-q-a/65583/nordic-nrf52840-usb-msc-file-corruption-issue/278065#278065">here</a>&nbsp;and <a href="https://devzone.nordicsemi.com/f/nordic-q-a/36654/usbd_msd-disk-initialization-fails-in-usb-unplug-with-sdk15-0/141462#141462">here</a>?</p> <p>Are you still able to reproduce the issue with those fixes in place?</p> <p>Einar</p><div style="clear:both;"></div>