Looking to sell an old computer and want to wipe the hard drive clean before you sell it? Whatever your reason may be, there are lots of programs out there that can help you to not only erase the data on a hard drive, but erase it in such a way that it can never be recovered again. If you have a lot of sensitive information, perform a secure wipe of your hard drive is highly recommended.
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- Bootable disk wipe tool ByebyeData Eraser Pro for Home Edition to erase everything on the hard disk drive including the Windows operating system. Securely overwrites and destroys data on disks, drives, free space, and individual files and folders.Support. Windows, Mac, and Linux or Unix. Although ByebyeData Eraser now works on Windows system, it still erases.
- Feb 28, 2010 You can use Disk Utility to erase the free space used by deleted files by having zeros written over the space once, 7 times, or 35 times. If you have a lot of free space on your disk, overwriting the free space several times can take a long time. Erasing free disk space does not erase the other files on your disk.'
- Apr 20, 2020 CBL Data Eraser software is another free secure file shredding software like HDShredder. And the tool can be used either by installing on Windows or as a bootable standalone program. The benefit of bootable file eraser software is that they run outside Windows and can wipe the entire disk with one just a few clicks.
Feb 08, 2018 In my case, I want to securely erase the free space on the disk with 120.5 GB, so its Identifier number would be ‘disk0s2’. With this information, you can now use the.
A secure wipe basically performs a low-level format so that the entire disk is overwritten with 0’s. Other software will write junk data multiple times over the disk so that there is no trace of what was there before. Either way, no one is going to be able to get the original data off the hard drive because it’ll be completely gone.
In this post, I’ll mention five fairly popular programs that you can use to really erase a hard disk properly. There are so many good free programs, that it’s really not necessary to spend any money on doing something like wiping a hard drive. You’ll pretty much get the same results using freeware.
DBan (Darik’s Boot and Nuke)
This is probably the most popular program and is basically a self-contained boot disk. Create a bootable CD using CDBurnerXP or whatever burning program you like and boot to the CD when prompted after restarting your computer.
You can choose from different wipe methods including Gutmann Wipe, Department of Defense Short and Medium and others. I’ve used this program several times and have found that it does an excellent job erasing data on many different types of hard drives. If, for some reason, DBan does not work for you, you can try out the other programs mentioned below.
KillDisk
KillDisk comes in two flavors: Free and Professional. The professional version is definitely better than DBan in terms of options, but it’s not worth shelling out $40 or $50. The free version only has one way to delete the data on a hard drive (erasing with one-pass zeroes), but it’s still good enough for a decent hard drive wipe. Definitely DBan is better since you can use the DoD 5220.22-M protocol.
If you do purchase the program, then you have a great set of 17 choices for deleting your data:
You can use the program from within Windows directly, via DOS or use bootable media so you can wipe any disk whether it was running Windows, Linux, OS X, etc. If you need to erase a large number of disks, it might be worth the monetary investment, otherwise you’re good with the free version.
Disk Wipe
Another good freeware app is Disk Wipe. The only downside is that it is a Windows app, so you have to run it from within an already existing operating system, whereas the other two mentioned above can be booted to using a CD or floppy disk. And since it’s a Windows app, it can really only erase hard drives that are Windows formatted (NTFS, FAT32, FAT, etc).
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However, if that is not a problem for you, then the program is great! It’s portable and doesn’t require any installation, so you can carry it around on a USB stick or just email it to yourself. It can wipe hard drives, memory sticks, SD cards, etc.
It also supports the advanced algorithms like DoD 5220-22.M, US Army, and Peter Guttman.
Eraser
Another program that is similar to Disk Wipe is Eraser. The software is open-source and is routinely updated. The latest version supports Windows 7 and Windows Server 2008. Again, the downside is that it only supports the Windows operating system and can only erase the data on drives that support Windows.
Eraser does not support as many advanced algorithms as the other programs mentioned above and is therefore not the best option if you really need to securely erase your hard drive. It’s a free option and does the job, but there is more risk using this program.
HDD Low Level Format Tool
This program is free, but has a speed cap on it, which is around 180GB per hour. If you spend a whopping $3, you can get the program without any speed cap. It supports SATA, IDE, SCSI, SAS, USB and Firewire drives, which is nice.
Again, like the last two mentioned, it only supports the Windows operating system, so if you have a hard drive from a different operating system, you’ll have to plug it into the Windows PC you are using.
Overall, your best options are DBan and KillDisk for really getting just about any hard drive wiped with the highest level of security. If those don’t work for you or the cost is too much, you can try any of the other three programs mentioned.
Is there a program that you use to wipe data securely? If so, post a comment here and let us know. Enjoy!
Optimized Storage in macOS Sierra and later* can save space by storing your content in iCloud and making it available on demand. When storage space is needed, files, photos, movies, email attachments, and other files that you seldom use are stored in iCloud automatically. Each file stays right where you last saved it, and downloads when you open it. Files that you’ve used recently remain on your Mac, along with optimized versions of your photos.
* If you haven't yet upgraded to macOS Sierra or later, learn about other ways to free up storage space.
Find out how much storage is available on your Mac
Choose Apple menu > About This Mac, then click Storage. Each segment of the bar is an estimate of the storage space used by a category of files. Move your pointer over each segment for more detail.
Click the Manage button to open the Storage Management window, pictured below. This button is available only in macOS Sierra or later.
Manage storage on your Mac
The Storage Management window offers recommendations for optimizing your storage. If some recommendations are already turned on, you will see fewer recommendations.
Store in iCloud
Click the Store in iCloud button, then choose from these options:
- Desktop and Documents. Store all files from these two locations in iCloud Drive. When storage space is needed, only the files you recently opened are kept on your Mac, so that you can easily work offline. Files stored only in iCloud show a download icon , which you can double-click to download the original file. Learn more about this feature.
- Photos. Store all original, full-resolution photos and videos in iCloud Photos. When storage space is needed, only space-saving (optimized) versions of photos are kept on your Mac. To download the original photo or video, just open it.
- Messages. Store all messages and attachments in iCloud. When storage space is needed, only the messages and attachments you recently opened are kept on your Mac. Learn more about Messages in iCloud.
Storing files in iCloud uses the storage space in your iCloud storage plan. If you reach or exceed your iCloud storage limit, you can either buy more iCloud storage or make more iCloud storage available. iCloud storage starts at 50GB for $0.99 (USD) a month, and you can purchase additional storage directly from your Apple device. Learn more about prices in your region.
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Optimize Storage
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Click the Optimize button, then choose from these options.
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- Automatically remove watched movies and TV shows. When storage space is needed, movies or TV shows that you purchased from the iTunes Store and already watched are removed from your Mac. Click the download icon next to a movie or TV show to download it again.
- Download only recent attachments. Mail automatically downloads only the attachments that you recently received. You can manually download any attachments at any time by opening the email or attachment, or saving the attachment to your Mac.
- Don't automatically download attachments. Mail downloads an attachment only when you open the email or attachment, or save the attachment to your Mac.
Optimizing storage for movies, TV shows, and email attachments doesn't require iCloud storage space.
Empty Trash Automatically
Empty Trash Automatically permanently deletes files that have been in the Trash for more than 30 days.
Erase Free Disk Space Mac
Reduce Clutter
Reduce Clutter helps you to identify large files and files you might no longer need. Click the Review Files button, then choose any of the file categories in the sidebar, such as Applications, Documents, Music Creation, or Trash.
You can delete the files in some categories directly from this window. Other categories show the total storage space used by the files in each app. You can then open the app and decide whether to delete files from within it.
Learn how to redownload apps, music, movies, TV shows, and books.
Where to find the settings for each feature
The button for each recommendation in the Storage Management window affects one or more settings in other apps. You can also control those settings directly within each app.
- If you're using macOS Catalina, choose Apple menu > System Preferences, click Apple ID, then select iCloud in the sidebar: Store in iCloud turns on the Optimize Mac Storage setting on the right. Then click Options next to iCloud Drive: Store in iCloud turns on the Desktop & Documents Folders setting. To turn off iCloud Drive entirely, deselect iCloud Drive.
In macOS Mojave or earlier, choose Apple menu > System Preferences, click iCloud, then click Options next to iCloud Drive. Store in iCloud turns on the Desktop & Documents Folders and Optimize Mac Storage settings. - In Photos, choose Photos > Preferences, then click iCloud. Store in iCloud selects iCloud Photos and Optimize Mac Storage.
- In Messages, choose Messages > Preferences, then click iMessage. Store in iCloud selects Enable Messages in iCloud.
- If you're using macOS Catalina, open the Apple TV app, choose TV > Preferences from the menu bar, then click Files. Optimize Storage selects “Automatically delete watched movies and TV shows.”
In macOS Mojave or earlier, open iTunes, choose iTunes > Preferences from the menu bar, then click Advanced. Optimize Storage selects “Automatically delete watched movies and TV shows.” - In Mail, choose Mail > Preferences from the menu bar, then click Accounts. In the Account Information section on the right, Optimize Storage sets the Download Attachments menu to either Recent or None.
Empty Trash Automatically: From the Finder, choose Finder > Preferences, then click Advanced. Empty Trash Automatically selects “Remove items from the Trash after 30 days.”
Other ways that macOS helps automatically save space
With macOS Sierra or later, your Mac automatically takes these additional steps to save storage space:
- Detects duplicate downloads in Safari, keeping only the most recent version of the download
- Reminds you to delete used app installers
- Removes old fonts, languages, and dictionaries that aren't being used
- Clears caches, logs, and other unnecessary data when storage space is needed
How to free up storage space manually
Even without using the Optimized Storage features of Sierra or later, you can take other steps to make more storage space available:
- Music, movies, and other media can use a lot of storage space. Learn how to delete music, movies, and TV shows from your device.
- Delete other files that you no longer need by moving them to the Trash, then emptying the Trash. The Downloads folder is good place to look for files that you might no longer need.
- Move files to an external storage device.
- Compress files.
- Delete unneeded email: In the Mail app, choose Mailbox > Erase Junk Mail. If you no longer need the email in your Trash mailbox, choose Mailbox > Erase Deleted Items.
Learn more
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- The Storage pane of About This Mac is the best way to determine the amount of storage space available on your Mac. Disk Utility and other apps might show storage categories such as Not Mounted, VM, Recovery, Other Volumes, Free, or Purgeable. Don't rely on these categories to understand how to free up storage space or how much storage space is available for your data.
- When you duplicate a file on an APFS-formatted volume, that file doesn't use additional storage space on the volume. Deleting a duplicate file frees up only the space required by any data you might have added to the duplicate. If you no longer need any copies of the file, you can recover all of the storage space by deleting both the duplicate and the original file.
- If you're using a pro app and Optimize Mac Storage, learn how to make sure that your projects are always on your Mac and able to access their files.