public static boolean isSdcardExists(Context context) {

        StorageManager storageManager = StorageManager.from(context.getApplicationContext());
        List<VolumeInfo> volumes = storageManager.getVolumes();
        for (VolumeInfo volInfo : volumes) {
            DiskInfo diskInfo = volInfo.getDisk();
            if
 
 (diskInfo != null && diskInfo.isSd()) {
                String sdcardState = volInfo.getEnvironmentForState(volInfo.getState());
                if (Environment.MEDIA_MOUNTED.equals(sdcardState)) {
                    return true;
                }
            }

        }
        return false
 
;
    }

    public static int isudiskExists(Context context) {
        int num = 0;
        StorageManager storageManager = StorageManager.from(context.getApplicationContext());
        List<VolumeInfo> volumes = storageManager.getVolumes();
        for (VolumeInfo volInfo : volumes) {
            DiskInfo diskInfo = volInfo.getDisk();
            if
 
 (diskInfo != null && diskInfo.isUsb()) {
                String sdcardState = volInfo.getEnvironmentForState(volInfo.getState());
                if (Environment.MEDIA_MOUNTED.equals(sdcardState)) {
                    num++;
                }
            }

        }
        return num;
    }