How to delete files from computer completely?
Regular ways of deleting files actually are not deleting them permanently but temporarily, because data recovery programs are easy to find the data remanences by scanning every sector on the hard drive and get deleted data back.
How to completely delete files from the computer?
First we should know how's the 'delete' operation work, when we press the delete button on the keyboard or choose this option from the right-click menu of a file, the file will first go to the recycle bin if you haven't changed any settings, then you can empty it to free up space, that's what we always do to clean up hard drive when the disk is run out of space and that's also enough when we still want to work on this computer while we still have all the admin privileges to this device or while we don't have sensitive data to erase.
That being said, things might be different when the computer belongs to the company.
Business data on the original hard drive shall be cleaned before you upgrade the old device to new generation or when you have to get rid it. Under these circumstances, deleting files with the common way won't keep data safe.
You may have thought the 'format' operation, but the truth, format won't help to clean data either, recovery software still able to retrieve data on formatted disks, partitions and removable storage devices.
So we have to something else after the delete and format operations, which will bring us to the second step:
Erase free space
Free space equals to the space of deleted files and space unused, although it empty when you open Windows files explorer, it actually contains lots of traces of the files we just deleted, to be more specific, they're exactly the contents of deleted files. You may wonder 'then what have we deleted since all the contents are still here?', in fact, it's the headings or references, which mean nothing to the recovery software, that we just deleted when we click the delete option.
Erase free space will then overwrite the unused space and the deleted files' space to make the hard drive clean again. Windows, by default, has a tool to wipe free space, but it's command line based and wipe free space for 3 times, that's to overwrite the free space for three times, which is time costing and not necessary, since you only have to wipe the disk for once to make data clean.
ByebyeData Eraser, a data sanitization program, is able to wipe free space for one time or multiple-times, it's your choice.
Why you built-in multiple overwrite plans when you say one-pass overwriting is enough for data cleaning?
We're doing this for users of college, university or companies.
Many organizations have their own compliant about how to wipe data, for example, Berkeley University requires:
Delete data using secure software to overwrite data multiple times. Compliant delete options include DoD 3 pass overwrite standard (DoD 5220.22-M) (link is external) and Secure Erase (link is external).
Some companies would ask a clean hard drive when employees resigned or upgraded the hard drive.
Besides, this program built-in many other international erasing standards as well, click here to learn more.
How to erase free space?
Download the software, install it to any path and run it as administrator.
1st, click on the erase free space tab and select the drive you want to erase, you may have remembered which partition you once put all the deleted files on, select it. Or if you want to wipe all the partitions on the disk, you can right-click on the empty area and 'Select All'.
2nd, Now specify one wiping plan for the selected items, although we advised on the simple overwriting methods and set the zero-filling method as default, you're free to choose other erasure standards,
3rd, Click Erase Now and confirm to Yes when ByebyeData Eraser asked.
Or you can just check the screenshots guide below: