isStorageVolumeAnSdCard()

// Returns true if the given StorageVolume is an SD card.
// This reads the proc/mounts file, which contains mount info for all drives on device.
// A USB drive will show on a line like: /dev/block/vold/public:8,1 on /mnt/media_rw/68C9-D020 type vfat (rw,dirsync,nosuid,nodev,noexec,noatime,uid=1023,gid=1023,fmask=0007,dmask=0007,allow_utime=0020,codepage=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro)
// An SD card will show on a line like:  /dev/block/vold/public:179,65 on /mnt/media_rw/084E-056D type vfat (rw,dirsync,nosuid,nodev,noexec,noatime,uid=1023,gid=1023,fmask=0007,dmask=0007,allow_utime=0020,codepage=437,iocharset=iso8859-1,shortname=mixed,utf8,errors=remount-ro)
// The /dev/block/vold/public:8 indicates a USB drive at 68C9-D020, while /dev/block/vold/public:179 indicates an SD card at 084E-056D.
@RequiresApi(ANDROID_7_SDK_24)
fun isStorageVolumeAnSdCard(storageVolume: StorageVolume): Boolean {
    if (storageVolume.uuid == null) return false

    var bufferedReader: BufferedReader? = null
    var inputStream: InputStream? = null
    var inputStreamReader: InputStreamReader? = null
    var sdCardFound = false
    try {
        val runtime = Runtime.getRuntime()
        val process = runtime.exec("mount")
        inputStream = process.inputStream
        inputStreamReader = InputStreamReader(inputStream)

        bufferedReader = BufferedReader(inputStreamReader)
        bufferedReader.forEachLine { line ->
            if (line.contains(storageVolume.uuid!!, true) && line.contains("fat")
                && line.contains("media_rw") && line.contains("/dev/block/vold/public:179")
            ) {
                sdCardFound = true
                return@forEachLine
            }
        }
    } catch (ignored: Exception) {
    } finally {
        try {
            bufferedReader?.close()
            inputStream?.close()
            inputStreamReader?.close()
        } catch (ignored: Exception) {
        }
    }
    return sdCardFound
}