On Friday 09 February 2018 11:01:38 Thomas Schmitt wrote: > Hi, > > > # skip rules for inappropriate block devices > > KERNEL=="fd*|mtd*|nbd*|gnbd*|btibm*|dm-*|md*|sdd", > > GOTO="persistent_storage_end" > > That's a neighbor of where i once stopped to experiment. > So now: > > KERNEL=="fd*|mtd*|nbd*|gnbd*|btibm*|dm-*|md*|zram*|mmcblk[0-9]*rpmb|sr >4", GOTO="persistent_storage_end" > > But still immediate "No medium" and nearly immediate ejection of tray. > (It seems that it ejects if the previously inserted tray was empty.) > > I switched off-and-on the USB box with the drive. No improvement. > Grrr. > > > bs=65536, then count=122,070 covers 8Gb [...] > > 7999979520 bytes (8.0 GB) copied, 399.487 s, 20.0 MB/s > > Sparsely and only ISO GBs. > I'd rather assume the larger count=131072 = 8589934592 = 8 GiB. > > > dd if=/dev/sdd of=rock-img-shrunk.img bs=65536 count=122070 > > gparted can't see a thing except an empty card. WTF? > > Here you copied /dev/sdd to rock-img-shrunk.img. > > Quote from the other thread, "a hexeditor please": > > Used dd to make a file of the first 8Gb, wrote that 8Gb to another > > identical 64Gb card. > > By what command did you copy the file to the other card ? > dd if=rock-img-shrunk.img bs=65536 count=122070 of=/dev/sdd Which is the reverse direction of the command generated that file...
> What do other partition editors report about rock-img-shrunk.img > and the other card ? > E.g. > /sbin/fdisk -l rock-img-shrunk.img > /sbin/fdisk -l /dev/sdd When did fdisk learn about GPT part tables? gene@coyote:~/rock64.imgs$ /sbin/fdisk -l rock-img-shrunk.img WARNING: GPT (GUID Partition Table) detected on 'rock-img-shrunk.img'! The util fdisk doesn't support GPT. Use GNU Parted. Disk rock-img-shrunk.img: 7999 MB, 7999979520 bytes 255 heads, 63 sectors/track, 972 cylinders, total 15624960 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 Disk identifier: 0x00000000 Device Boot Start End Blocks Id System rock-img-shrunk.img 1 1 125171711 62585855+ ee GPT And gene@coyote:~/rock64.imgs$ /sbin/fdisk -l /dev/sdd Disk /dev/sdd: 64.0 GB, 64021856256 bytes 255 heads, 63 sectors/track, 7783 cylinders, total 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 Disk identifier: 0x00000000 Device Boot Start End Blocks Id System /dev/sdd 1 32768 125042687 62504960 7 HPFS/NTFS/exFAT huh???? > (I assume they do not need hdparm -z which lets the kernel re-assess > the partition table.) > > > Do we have a better hex editor? > > First parts of partition tables should be to see within the first 1024 > bytes. > > dd if=/dev/sdd bs=1024 count=1 | od -t x1 | less > > The partition table of an MBR begins at byte 446, octal: 0676. > It ends 64 bytes later before 0776, where you should read "55 aa". > > GPT header begins at byte 512, octal 01000, by "EFI PART": > 0001000 45 46 49 20 50 41 52 54 ... > > > Have a nice day :) > > Thomas -- Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene>