So I'm relatively comfortable using *dd* on a linux system to copy the contents of an sd card to an image file. Previously I had run the command...
sudo dd status=progress bs=512 count=$((8192+6955008)) if=/dev/disk4 of= /path/to/image/storage/`date +%Y-%m-%d`_image_name.img ... and that usually does the trick. However, I'm a bit confused because the count value isn't lining up with the current card specs. I just created a flasher on a 16GB card using the aforementioned script. But when I insert that sd card to my development laptop and I run... sudo fdisk -l /dev/sdb ... I get the following output: $ sudo fdisk -l /dev/sdb [sudo] password for troyw: Disk /dev/sdb: 14.9 GiB, 15931539456 bytes, 31116288 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: 0x55866915 Device Boot Start End Sectors Size Id Type /dev/sdb1 * 8192 31116287 31108096 14.9G 83 Linux My confusion is that I recall the card should be 8192+6955008 sectors long, not 31116287 sectors long... So what happened? Did something change recently in the aforementioned flasher-making script? Does it now automatically expand to the sd card size? Do I need to re-partition the */dev/sdb* device and *then* use the *dd* command? How would I determine how much I can shrink the partition without losing the data on the image? Any help would be greatly appreciated. On Monday, February 5, 2018 at 7:17:17 AM UTC-8, Dennis Lee Bieber wrote: > > On Mon, 5 Feb 2018 04:41:12 -0800 (PST), > 82am...@gmail.com <javascript:> declaimed the following: > > > > > >My problem is that I would like to save the images that were created in > the > >SD card in the PC, in order to have several releases saved. When I insert > >the SD card into the PC, I try to open it to make a copy of the image, I > >get a message saying that it can not be opened and also asks if I want to > >format the SD card. > > > > M$ Windows OS? > > >Someone could help me to know how I can copy those images to my PC to > save > >them. > > > > The (apparently deprecated) Win32DiskImager program appears to > have the > ability to move in both directions -- so can generate an image file by > reading an SD card (Etcher appears to only support writing an image file > TO > SD card). > > However, as I recall, it was rather sensitive to the card used -- > I'd > tried to duplicate a card (both nominally 8GB) but the target card > (another > brand) was just different enough that the image could not be written (I > think the target card reserved more blocks for overhead, with the result > the original image was now too large for the target). > -- > Wulfraed Dennis Lee Bieber AF6VN > wlf...@ix.netcom.com <javascript:> HTTP://wlfraed.home.netcom.com/ > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/1f3c92e7-48ab-49c5-b1ab-fc9f2382228e%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
