On Friday 09 February 2018 14:37:16 Thomas Schmitt wrote: > Hi, > > your count=122070 was too small. It should have been 128912. See > below. > > Gene Heskett wrote: > > gene@coyote:~/rock64.imgs$ /sbin/gdisk -l rock-img-shrunk.img > > [...] > > Caution: invalid backup GPT header, but valid main header; > > regenerating backup header from main header. > > You cut off ~ 56 GB of the original device data. At the very end of > the original there is the GPT backup copy. So it was not copied. > > > Warning! One or more CRCs don't match. You should repair the disk! > > This is not a good sign. GPT has checksums in the header block. One > for the header itself and one for the partition entries array. > If any does not match, then some partition editing did not what it > was supposed to do. > Well, old sins ... > > > Total free space is 108670973 sectors (51.8 GiB) > > gdisk seems still to believe in the size which it found in the copied > GPT header block. Hopefully this misbelief would end if the image was > copied successfully to a new storage medium. > Nevertheless, gdisk or an other partition editor will then have to > adjust this size field in the GPT (and the checksums) to the real > storage device size. > > > Number Start (sector) End (sector) Size Code Name > > 1 64 8063 3.9 MiB 8300 loader1 > > 2 8064 8191 64.0 KiB 8300 reserved1 > > 3 8192 16383 4.0 MiB 8300 reserved2 > > 4 16384 24575 4.0 MiB 8300 loader2 > > 5 24576 32767 4.0 MiB 8300 atf > > 6 32768 262143 112.0 MiB 0700 boot > > 7 262144 16500735 7.7 GiB 8300 root > > The first six partitions should be like on the original card. > I am not so sure about number 7. > Does it have the same size on the original card ? > > If it is like on the original: > For a good copy up to the end of partition 7 you would have had to > copy 16500735*512/65336 = 128912 blocks. > > So now your copy lacks the last 6842 * 65336 = 447,028,912 bytes of > partition 7. > With a copy of 128912 * 64 KiB the image file should be good and you'd > only have to solve the riddle why the new card did not take the bytes > you copied to it (or why it put them at the wrong place).
Blame that on gparted which did not update the ending GPT table when I shrank part 7 from 59.6 GB to about 7 so it would fit on a smaller sd card. but: gdisk /dev/sdd x e w seems to have fixed that, gparted is now as happy as a clam. > 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>
