Helios64 64GB usdcard is mmcblk0 16GB internal EMMC is mmcblk1 /dev/mmcblk0: Timing cached reads: 2082 MB in 2.00 seconds = 1041.24 MB/sec HDIO_DRIVE_CMD(identify) failed: Invalid argument Timing buffered disk reads: 70 MB in 3.08 seconds = 22.70 MB/sec root@filer1:/var/tmp# hdparm -tT /dev/mmcblk1 /dev/mmcblk1: Timing cached reads: 2132 MB in 2.00 seconds = 1066.10 MB/sec HDIO_DRIVE_CMD(identify) failed: Invalid argument Timing buffered disk reads: 520 MB in 3.00 seconds = 173.16 MB/sec root@filer1:/var/tmp# ls -lrt -rw-r--r-- 1 root root 474826472 Oct 20 18:45 Armbian_20.08.13_Helios64_buster_current_5.8.16.img.xz root@filer1:/var/tmp# time xz -v -d Armbian_20.08.13_Helios64_buster_current_5.8.16.img.xz Armbian_20.08.13_Helios64_buster_current_5.8.16.img.xz (1/1) 55.2 % 250.3 MiB / 1,159.8 MiB = 0.216 17 MiB/s 1:09 1 min 0 s 90.7 % 411.1 MiB / 1,573.0 MiB = 0.261 17 MiB/s 1:30 9 s 100 % 452.8 MiB / 1,788.0 MiB = 0.253 19 MiB/s 1:34 real 1m34.507s user 0m58.994s sys 0m6.523s root@filer1:/var/tmp# ls -l -rw-r--r-- 1 root root 1874853888 Oct 20 18:45 Armbian_20.08.13_Helios64_buster_current_5.8.16.img root@filer1:/var/tmp# fdisk -l /dev/mmcblk0 Disk /dev/mmcblk0: 59.6 GiB, 64021856256 bytes, 125042688 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: dos Disk identifier: 0x5fc5f35a Device Boot Start End Sectors Size Id Type /dev/mmcblk0p1 32768 123792255 123759488 59G 83 Linux root@filer1:/var/tmp# fdisk -l /dev/mmcblk1 Disk /dev/mmcblk1: 14.6 GiB, 15634268160 bytes, 30535680 sectors Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes root@filer1:/var/tmp# time dc3dd if=Armbian_20.08.13_Helios64_buster_current_5.8.16.img of=/dev/mmcblk1 dc3dd 7.2.646 started at 2020-10-20 20:01:55 -0700 compiled options: command line: dc3dd if=Armbian_20.08.13_Helios64_buster_current_5.8.16.img of=/dev/mmcblk1 sector size: 512 bytes (assumed) 368836608 bytes ( 352 M ) copied ( 20% ), 2 s, 184 M/s 611876864 bytes ( 584 M ) copied ( 33% ), 6 s, 95 M/s 923107328 bytes ( 880 M ) copied ( 49% ), 12 s, 75 M/s 1058439168 bytes ( 1009 M ) copied ( 56% ), 14 s, 71 M/s 1391886336 bytes ( 1.3 G ) copied ( 74% ), 21 s, 65 M/s 1688928256 bytes ( 1.6 G ) copied ( 90% ), 26 s, 62 M/s 1874853888 bytes ( 1.7 G ) copied ( 100% ), 35 s, 52 M/s input results for file `Armbian_20.08.13_Helios64_buster_current_5.8.16.img': 3661824 sectors in output results for device `/dev/mmcblk1': 3661824 sectors out dc3dd completed at 2020-10-20 20:02:29 -0700 real 0m34.675s user 0m1.349s sys 0m12.731s