Erasing a disk or volume permanently deletes all of its files. How to erase a disk Proceed based on whether you're erasing your startup disk or some other disk. Your startup disk is the disk volume that your Mac started up from. By default it's the disk built into your Mac, named Macintosh HD. The steps above also work when erasing a storage device that you're not using as a startup disk.
And you don't need to delete data volumes first: just select your disk in Disk Utility, then click Erase. In some circumstances, you might need to change the partition map scheme while erasing. If you're following instructions that require choosing a scheme, the steps in Disk Utility differ from the steps above. Are you formatting the disk that came built into your Mac? Are you about to install macOS High Sierra or later on the disk?
If you need to erase your disk before installing High Sierra or later for the first time on that disk, choose Mac OS Extended Journaled. Are you preparing a Time Machine backup disk or bootable installer?
Will you be using the disk with another Mac? Disk Utility tries to detect the type of storage and show the appropriate format in the Format menu. If Disk Utility shows the sidebar, but your disk doesn't appear within it, disconnect all nonessential devices from your Mac. If the disk is external, leave it connected, but make sure that it's turned on and connected directly to your Mac using a good cable. Then restart your Mac and try again.
Learn how to get your Mac ready for service. Erase a startup disk Start up from macOS Recovery. Then click Continue. Make sure that the sidebar in Disk Utility shows the name of your startup disk.
The volume representing your startup disk is Macintosh HD, unless you renamed it. Don't see it? When you're asked to confirm, click the Delete button.The standard may have extensions, such as the e. MMC Security Extension. For more information about flash technologies, check our additional resources:. The eMMC is an evolving standard.
MMCElectrical Standard 5. The eMMC standard provides an interface in which the device is seen and treated as a block device by Linux. On the other hand, eMMC is widely different from those and its peculiarities must be taken into consideration when choosing and configuring the file system. As of the embedded Linux BSP 2. The eMMC device has a boot areawhich is seen as a different block device than the regular user area. From the above output, notice that boot area does not have a partition table.
In addition, the user area size is bytesbeing bytes for the kernel and device tree partition and bytes for the root file system. Alternatively, one could get the block devices and partition sizes using the command lsblk :. Using the command dfyou'll notice that the size reported by the file systems is slightly smaller than the user area partitions:. From the command above the total size of the kernel and device tree partition is bytes and the root file system is bytes.
This reports the actual usable space for each partition and happens due to file system overhead - things such as the inode table and file system journal. Even though discouraged, it is possible to copy the eMMC contents for backup or replication purposes. There is a specific article for this topic:. The Linux kernel provides a tool chest for configuring MMC devices from user space named mmc-utils.
If you want to use the upstream version, it can be easily built using OpenEmbedded. Both variants upstream and downstream can be built and installed concurrently in the same image, due to update-alternatives support. Mmc-utils makes it possible to query information from the device as well as configure features. Some examples are health statusenhanced user areawrite reliabilitysanitizecache and write protection.
Use the command help to list all available features:. Flash manufacturers may provide their own eMMC tools.When you create a recovery partition for Windowsit's best to store it on an external drive in case something happens to your computer. After saving it somewhere else, you can delete the recovery partition from your PC to free up space. Because recovery partitions are protected, the steps for removing them differ from deleting a normal partition:.
If you're using Windows 7 or earlier, you'll have to open Command Prompt another way, like through the Start menu or Run dialog box. A list of disks will be displayed. If there are multiple disks and you're unsure which one its on, you can find out by opening the Disk Management tool. A list of partitions will be displayed.
Deleting a recovery partition will create a section of unallocated space on your drive. In order to use the unallocated space, you must format the partition:. Beside the disk number for your hard drive, you'll see a number of partitions, including one named Unallocated. Right-click the Unallocated partition and select New Simple Volume. Enter how much data the new partition should use out of the unallocated space, then select Next.
Choose a letter from the drop-down menu to assign to the partition, then select Next. Enter a name for the partition in the Volume label field, then select Next. If you want to expand another partition to use the extra space, then the unallocated space must appear to the immediate right of that partition in the Disk Management tool. To extend a partition:.
Select Finish. The Windows partition will be resized to include the extra space. Tweet Share Email. Instructions in this article apply to Windows 10, Windows 8, and Windows 7.
Type diskpart and press Enter. Select Next to continue. Right-click the partition you want to expand and select Extend Volume. Enter how much of the unallocated space you want to use, then select Next.
More from Lifewire.Data Recovery for Windows. Data Recovery for Mac. Data Recovery for iPhone. Professional computer users know how to easily recover deleted or formatted data from MMC multi-media card card with free Data Recovery Software. But, in some cases, we need permanently wipe the data on the MMC card.
How to delete a package in the Management Console
For instance, before throwing a crashed MMC card into trash, we would make sure all the private data on the MMC card has been permanently erased. AweEraser is the reliable MMC card data eraser. It offers certified data erasure algorithms including DOD Army AR 7 passesPeter Gutmann's algorithm 35 passes. So it can permanently wipe data from MMC card and other storage media.
Once the data is erased by AweEraser, it is lost forever.
mmc erase fails from U-Boot command line
So please back up your data to your hard drive before you wipe the MMC card. If you don't want the private data on the MMC card to fall into the wrong hands, you have to permanently destroy all the data before you resell, donate, give away or lend your MMC card. AweEraser gives you three modes to wipe data on MMC card.
If you want to erase specific files on your MMC card, this mode is perfect for you. Just add the files and erase them with AweEraser. How to prevent the previously deleted data on MMC card from being recovered by data recovery software? This mode will help you erase free space on MMC card to avoid deleted data recovery. Then your MMC card is able to be resold, donated, reused, or recycled. Mac Cleaner AweCleaner for Mac. Anna updated on to Data Erasure. Download for PC Download for Mac.
Related Products AweEraser for Windows Securely shred files and wipe hard drive with military data erasure standards. How to Permanently Delete Documents?Need support for your remote team? Check out our new promo! Why EE? Get Access. Log In. Web Dev. NET App Servers. We help IT Professionals succeed at work. Last Modified: I had a question today where the user wanted to know how to delete an SSL Certificate, so I thought that I would quickly add this How to!
Article for your reference. If an incorrect certificate was installed on your machine 2. If you get a certificate error stating that your current certificate is corrupt. When testing certificates in your environment, and thus need to delete the temporary installed certificates.
Your updated snap-in window should now have the Certificate Local Computer in the "Selected snap-ins:" column of the window, so it should look like the following image. In my case the certificate was installed in the Personal tree object or folder as referred to by some.
But please go through all the sub folders to ensure that the certificate that you are trying to delete is deleted from all the folders that it resides in. Next a Certificate warning window will be presented for you to confirm the deletion of your certificate, it will look like the below window. That concludes this tutorial. Please let me know should you have any questions or would like me to add anything to this article.
Please rate this article or leave a comment if it was helpful? Kind Regards, Hendrik Wiese. Author: Hendrik Wiese. Ask questions about what you read. If you have a question about something within an article, you can receive help directly from the article author. Experts Exchange article authors are available to answer questions and further the discussion. Our Company Why EE? Experts Exchange Take hold of your future.
I need to securely erase an MMC card in an embedded system. Is it a feature of the card, the controller, the driver, the way the kernel is built, or something else? Can it be done? In this case the code is checking for the erase class of commands.
None of these depend on how the kernel is built, but the capabilities of your hardware. To find out which one s are preventing you using secure erase you will need to add some instrumentation to your kernel to print the values of these fields. Learn more. Asked 2 years ago. Active 2 years ago.
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Technical site integration observational experiment live on Stack Overflow. Dark Mode Beta - help us root out low-contrast and un-converted bits. Triage needs to be fixed urgently, and users need to be notified upon…. Related Various tasks are performed with U-Boot commands. On the U-Boot console, you can list the available commands with "help", and get more information about each command with "help command".
Auto-boot executes the command[s] specified in the bootcmd environment variable. The default configuration is:. This basically tells us that it will load the content of the NAND partition kernel to memory address 0x and then try to boot it.
You have commands to display, alter, and store the environment. The following example shows how to manipulate an individual definition, and store the updated environment in flash:. The following set of commands loads the file u-boot. The following set of commands loads the file rootfs. Please note that this will only work with root file system sizes that are smaller than the amount of memory above 0x, which in the case of 64MB SDRAM is something like 32MB.
Warning : you risk bricking your phone if you attempt to read in too large a file as extload appears to write the overflow into dangerous parts of memory address space. For a detailed description of the charger basics, see Neo Battery Charger.
Using neo charger fast you can force the PMU to try to do a fast mA charge of the battery. It will abort if the battery is in over temperature or some other error condition occurs.
The following commands will add a boot menu entry that switches to fast charging and turns off the backlight:. While in this state, your Neo can be charged with a generic USB charger. You also need to set. You can switch the backlight on and off by using neo backlight on and neo backlight off respectively.
You can switch the vibrator on and off by using neo vibrator on and neo vibrator off respectively. Starting with Openmoko patchset SVN revisionu-boot contains support for powering the GSM modem, and even accessing the modem from the console. You can switch the GSM modem on and off by using neo gsm on and neo gsm off respectively. First, you have to make sure that ipaddrserveripethaddr and netmask are set correctly in the environment:.
Wiki Docs Planet Lists. U-Boot commands From Openmoko. Jump to: navigationsearch. Category : Bootloaders. Views Page Discussion View source History.
Personal tools Log in. News Portal User Groups. This is the case with a wall outlet charger, or if you are attached to a self-powered hub or a desktop PC root hub. Bus powered hubs and some laptops only provide mA on their USB ports and can thus not support fast charging.