Error: This disk needs to be repaired using the Recovery HD. Restart your computer, holding down the Command key and the R key until you see the Apple logo. When the OS X Utilities window appears, choose Disk Utility.
I was having similar problems. I have both an old MacBook Pro (2010) and a 2014 Mac Mini. With the MBP and a built-in keyboard, I can get to the Recovery without difficulty, using any of the specified methods.
The Mini has been entirely different, where the best I can do is a login screen that offers to reset the login password. For this, I am using not only a Windows keyboard, but also where the keyboard is connected to a KVM switch (i.e., USB connection from the Mini to the switch, and then keyboard attached to the switch).
After a bunch floundering, I found that at least with the Mini, timing is an issue. I had been pressing the specified keys as soon as I could after a restart during the startup chime. However, if I wait 3 seconds until the chime is done, and then press keys, I can get the recovery console.
I don't know if it's that the Mini is a little different than an MBP, my use of external keyboard through a KVM or a combination, but with the Mini, timing is significant, and it's necessary to wait until after the chime to press keys
If all the above answers don't work for you. Maybe try to hold the windows+r a little bit later when you press the power button. Some keyboards would not be recognized immediately when you press the power on button.
Be careful if you have any other storage devices attached to the box in question. One time, a friend of mine used DBAN to nuke a machine and accidentally wiped the same flash drive he booted from and DBAN was stored on.
I have used Active Boot with its Active Kill Disk (DOD rated wipe) for the last 5 years or so. The price is 100-120$ for a lisence, but I have to say, the tools this bootable flash OS holds are priceless. Active Kill Disk, mapping drives, remote connections, password wipes in the SAM DB for lost windows passwords, and plethora of other tools at your disposal all contained within a flash drive less than 256MB. It also contains Active Data Recovery, partition managers and a few other drive related tools, including Smart testing.
The above tools work well too, but its usually a matter of preference to the Admin, a lot of guys stick to what they like. I use Activeboot as its nearly the same as the old Super ERD Commander in the Win 2000 days only now has more tools. I have even run win32 applications and portable apps right from the os, as it the current version is built on the windows 7 environment.
I needed more space on my Windows partition... So I used Disk Utility to free up some space from the OS X partition, and upon restarting to Windows in order to add the free space to windows, I discovered that windows no longer boots! OS X still boots, but how can I fix my Windows partition without reinstalling Windows and losing all my data?
The Terminal commands below has been proven to work in this situation. It's a fix within the last year from someone with the same problem. Disk Utility and Boot Camp were never designed to cooperate. Unfortunately, they aren't labelled at all to prevent this kind of event from taking place.
For future reference, I believe the way to resize the partition is to do so in Boot Camp Assistant. Since you already did it, however, you'll need to adjust your partition manually in order to get it booting again. Of course, replace disk0 with your disk number which you can find in Disk Utility.
Now Reboot and hold the ALT key and check if Windows shows up and is bootable. If you get 'missing operating system', then Windows Startup Repair and see if Windows will comeback alive. If you notice the difference between the Disk Utility screen (two partitions) vs the fdisk output (or the GPT) there are 'hidden' partitions and the MBR partitioning style used for Windows allows a maximum of 4 partitions. If you need further explanation, read the original thread. Yosemite should not be installed on any machine that is critical to you. If only partitioning was done, but Yosemite was NOT installed, you are in better shape. Yosemite ignores and is unaware of bootcamp and creates an additional Recovery HD and moves things around.
As far as I know, the only way to properly create a bootable Lion disc/disk is to use Disk Utility on a working Mac. However, the other option is to use a Virtualbox VM to run OS X temporarily (scroll down for that info).
Open up Disk Utility and drag the DMG file into the left-hand sidebar. If you're burning it to a DVD, insert your DVD, select the disk image in the sidebar, and hit the "Burn" button. Skip down to the last step to use it.
If you want to burn Lion to a USB flash drive, plug it in and click on it in the left-hand sidebar in Disk Utility. Go to the Partition tab and select "1 Partition" from the dropdown menu. Choose "Mac OS Extended (Journaled) on the left.
Hit the Options button under the partition table and choose "GUID Partition Table". You'll need this to make the drive bootable on a Mac. Hit the Apply button when you're done to format your drive (note: it will erase everything on the drive).
For my own case, installed TransMac on my Windows 10 laptop but it failed to work when I am trying to burn a dmg file (macOS Big Sur) to an external USB flash drive. It says the dmg file could not be restored to a Mac volume.
Finally, I get it done by using UUByte DMG Editor. The process is quite smooth and the USB drive is recognized by my Mac Mini after burning dmg file to it. The trick in here is to format USB drive to FAT32 first before burning starts. And try to use an USB 3.0 drive as old USB 2.0 device might not be recognized by Mac.
Active@ Boot Disk provides an easy and reliable solution for accessing data and repairing your computer in the event that Windows completely refuses to start up. It contains a complete set of useful utilities to assist you with repair tasks, data recovery, system maintenance and data security...
To continue the train of reviews on software developed by LSoft Technologies Inc., I'll be reviewing one of their core products: Active@ Boot Disk. What this software proves itself to be is a powerful disk utility tool that allows the user to create a portable, working bootable disk that...
Basically, you need to command-shift-option-R reboot into the internet recovery utility, open a terminal and use "diskutil" and "gpt" to remove the partitions. At that point, you can reboot back into MacOS, open the usual DiskUtility.app and then remove the "empty space" you now have on your hard drive. That empty space will be refilled by your original partition.
I ha a similar issue and got two responses from Apple after emailing Tim Cook. They are below, hopefully they will be useful. I did things slightly differently, basically boot into recovery mode, the open disk utility, thus should allow you to remove the boot partition or bootcamp. It goes without say BACKUP BACKUP BACKUP before trying this as you may have to format both partitions/containers and then delete one and resize the on the disk utility lets you. However, the official method from Apple is as below
Once the logs have been gathered they will be compressed into a .gz file and created in the /tmp location. A finder window will pop up also once the file is created with the correct location. We need that file as well.
Bootdisk Utility is utility to create a bootable USB disk with the distribution Mac OS X and the boot (the bootloader). Besides, the software also supports disk format, backup or restore partition directly on the main window, settings, or uninstall driver BootCamp HFS+ RO.
Bootdisk Utility does not require installation, allowing the user to transfer the utility to a storage device such as USB to be running on the computer. The most important is Bootdisk Utility not add new entry to the Windows Registry. Download Bootdisk Utility on use will assist user to create a boot disk on a USB flash drive on the main window by clicking on the corresponding button. Users only need to provide hardware components appropriate and start the process.
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It will create one VHD for each disk on which selected volumes reside.It preserves the partitioning information of the disk, but only copiesthe data contents for volumes on the disk that are selected. Thisenables you to capture just system volumes and exclude data volumes, forexample.
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