title: File deletion on USB OTG Mass Storage Device
body: <p>I have an mp3 player that is connected to the smartphone.</p>
  
  <pre><code>The class is: 0x08 (Mass Storage)
  The subclass is: 0x05 (SFF-8070i)
  The protocol is: 0x50 (Bulk-Transfer Only)
  </code></pre>
  
  <p>(see the debug log from my previous question: <a href="https://stackoverflow.com/questions/54485506/usb-otg-file-deletion">USB OTG File Deletion</a>)</p>
  
  <p>For some strange reason, the <b>only working app</b> available for Android appears  OTG Disk Explorer Pro.  Yet it has no function of file deletion.</p>
  
  <p>Have you ever had such a problem before? Is there any apps for Android that works with connected storage devices properly?</p>
  
  <p>If not, would you point out how to implement file deletion according to ATAPI For Rewritable Media (INF-8070.PDF)?</p>
  
  <p><b>Edit:</b></p>
  
  <p>Alright.  I found a nice explanation on how to delete a file within FAT16 at the book "USB Mass Storage: Designing and Programming Devices and Embedded Hosts" on page 239.</p>
  
  <p>Okay.  Would you recommend some opensource project o a file manager for Android that I can massage into working with my mp3 player?</p>