Ways to Fix Corrupted/Damaged SD Card. I only use the WD drive for Time Machine.Tutorial: Repairing Corrupted SD Cards for the Raspberry Pi on MacCommon Signs Indicating SD Card Corruption/Damage. Click Repair Disk', but when I do click repair I get 'Error: Unable to unmount volume for repair' I am unable to copy any documents to the WD drive, as I get a message telling me that they are in use. When I try to verify the WD drive using disk utility I get 'Error: This disk needs to be repaired.
![]() Sd Card Unable To Unmount Volume For Repair How To Fix AThis is a fairly complicated procedure, but most of it only has to be done once and then you can fix corrupted cards quickly and efficiently. You can typically move the drive back to your Mac system and Erase it.This posting will walk through how to fix a corrupted SD Card for your Raspberry Pi using a Mac and VirtualBox. Have you ever had your Raspberry Pi stopped booting up? The red and the yellow lights flash a few times and then quit? These are classic symptoms of a corrupted SD Card.Try our step by step guide to fix an unable to write to the last block of the. Command-line can be used to eradicate 'Can't unmount disk. Terminal application allows you to control your Mac operations via the command prompt.Do this enough, you will corrupt your card. Powering your Raspberry Pi down without doing a “ sudo halt“. There seem to be four main scenarios during which SD Cards become corrupted:If you spend hours configuring an SD Card, then back it up. If you push it too far, things start not quite working correctly.OK, what can I do with a Corrupted SD Card?The first thing you can do is BEFORE you get corrupted, back up your SD Card on a regular basis. Poor power quality from the mains can also screw up your Raspberry Pi If it is blinking, there are issues. Watch the Red LED on newer Raspberry Pi’s. Marginal power supplies. ![]() Here is how to do it on a Mac.VirtualBox is a “virtualizer” which means that it allows you to install an operating system in a “Box” inside another operating system. Back up your SD Card, if possible. The process is similar for a PC, but requires different instructions to install and get VirtualBox working. If this link isn’t available, go to and find the latest release. Dmg file.Step 3: Double click on the VirtualBox.pkg iconStep 4: Follow the instructions to install VirtualBox in the applications directory.Step 5: Now download the installation file (.iso) for Ubuntu from this link: Note: Make sure you use this link – ubuntu-1510-desktop-i386.iso. Dmg file for the Mac OS X from this page:Step 2: Click on the downloaded. In this case we will be installing Linux (Ubuntu) on a Mac OS X platform.Step 1: Download the VirtualBox. Don’t worry, this is not your Mac OS X disk.Step 16: Select your Timezone. Iso image downloaded in Step 5.Step 14: Select “Install Ubuntu” from the screen, then “Continue” from the next screen and then keeping the defaults, finally “Install Now”.Step 15: Click “Continue” when asked to erase the virtual disk. Click Continue.Step 9: Click on continue until you are done, using all the defaults.Step 10: Click on settings and then on Storage and then on Controller: SATAStep 11: Enter 2 in port count! This is an important step not to miss! Click “OK” to closeStep 12: Ready to install Ubuntu now! Click the Start ButtonStep 13: When you are promoted to select an image, select the ubuntu. Linux and 64 bit will be automatically selected. Click the “X’ on the window and select “Send the shutdown signal”. If Ubuntu does not start (which happens often the first time), then hit the “x” in the corner and select “Power Off the Machine”.Step 19: Now you have your Ubuntu Virtual Machine running. Make sure you can remember it! Now hit “Continue” and you are installing Ubuntu.Step 18: Now click “Restart Now” when the installation is finished. The user on our machine is “development”. Adding spaces in directory names and filenames causes all sorts of issues. Look for your SD card and note the /dev path (/dev/disk4 in this case)Step 4: In the terminal window type (replacing /dev/diskX with what you found in Step 3): diskutil unmountDisk /dev/diskXStep 5: change directory in the terminal window to the “VirtualBox VMs” on our development machine this command is: cd "/Users/development/VirtualBox VMs"Note the quotes around the directory name. On a Mac Book, it will be on the side.Step 2: Open up a terminal window and type: diskutil listStep 3: You will see a list similar to this. This is the complicated part of this procedure.Step 1: Insert your SD Card into the reader on your Mac OS X machine. Lync for mac 2011 cannot share desktopWe next have to set the permissions on this file so your Ubuntu VirtualBox machine can read the file. Vmdk file pointing to your raw SD Card device. /sd-card.vmdk -rawdisk /dev/diskXStep 7: Now we have an. Type the following (replacing diskX with what you found in Step 3): sudo VBoxManage internalcommands createrawvmdk -filename. Repairing the SD CardStep 1: Select the top most icon on the Ubuntu Desktop. If it reports that it is busy (Mac OS X likes to remount things for some reason), repeat Step 4 and quickly do Step 10 again.Step 12: Start your Ubuntu Virtual machine with the start button.Now finally, we can repair the SD Card. Vmdk file built in Step 6 above. If port count is “1” change it to “2”Step 10: Click on the icon on the right of the Controller: SATA disk and select “Choose existing disk”. /sd-card.vmdkStep 8: Next we have to add the SD Card (a SATA device) in the Ubuntu virtual machine storage configuration built in the previous section.Step 9: Click on Settings in VirtualBox and select Storage. Note that the following picture shows you what you get on a clean, good SD Card. Type the following in the terminal window: sudo fsck -fy /dev/sdb2This may take a while, depending on the speed of your machine. We will fix the sdb2 partition on sdb. Note it may be different, but if you followed these directions, it should be the same.Step 5: Now the magic. That is your SD Card on the Ubuntu system. You will get a terminal window.Into the terminal window (you may have to enter your password from Step 17 in the section above)Step 4: Note the name “/dev/sdb”. You don’t have to delete the SD Card Ubuntu image. If you want to use Ubuntu without the SD Card, build another image in VirtualBox. Note that the image you built for the SD Card repair probably won’t boot without an SD Card plugged in. If the card is bad, look at mounting the SD Card under your Ubuntu Virtual machine and going into the file system to try to recover your most important files.The next time you need to repair an SD Card, you should only have to plug it into your Mac OS X and then start Ubuntu from VirtualBox. Start by looking at more “fsck repair” pages on the web. If it doesn’t work, you may have bigger issues.
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