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DiskDeleter provides 16 of the most critical data deletion methods

Erasing method according to the disc to be erased and the application

Data erasure does not "delete" the data, but "overwrites" fixed or random values ​​in the data area such as SSD or HDD so that the data cannot be restored.

 

16 types of erasing methods (grades)

 

Grades 1-4

Employee / personal data

Data erasure method in individuals and companies

When erasing data on employee / personal HDD or USB memory, select the erasing method of grades 1 to 4. Ideal for reuse within a company or home.

  • Data cannot be restored with general software
  • It may be possible to restore it using a device that reads the residual magnetism.
  • Data erasure time is short
  1. Zero light method Overwrites the data area with zeros (0x00). Data recovery using software is not possible after zero write. It may be restored by a device that reads the residual magnetism.
2. Random write method Overwrite the data area with random numbers. Data recovery using software is not possible after random write. It may be restored by a device that reads the residual magnetism.
3. NIST 800-88 method A method for erasing flash media such as SSDs that comply with the latest NIST 800-88 recommended by the National Institute of Standards and Technology. After overwriting the entire disk area with zero (0x00), write verification is performed.
4. Random & zero write method Overwrite the data area with a random number and then overwrite zero (0x00). Data recovery using software is not possible. It may be restored by a device that reads the residual magnetism.
Grades 5-11

Confidential information / customer data

How to delete confidential information / customer data

If the computer to be discarded or returned for lease contains confidential information or customer data, we recommend a grade 5 or higher erasing method. Since it uses an advanced erasing method, it takes time to complete erasing.

  • Data cannot be restored with software and devices that read residual magnetism
  • Due to the advanced erasure method, the data erasure time is long.
  5. NIST 800-88 Advanced method A method for erasing flash media such as SSDs that comply with the latest NIST 800-88 recommended by the National Institute of Standards and Technology. After overwriting the entire disk area with a random number, overwrite it with zero (0x00) and perform write verification.
6. Current NSA method
(random random zero)		 Overwrites the entire disk area with random numbers twice and then overwrites zeros (0x00). It cannot be restored by software restoration and a device that reads residual magnetism.
7. US Department of Defense compliant method
DoD5200.28-M		 Overwrites the entire disk area with fixed values ​​(0xff), zeros (0x00), and random numbers. An erasing method known as DoD5200.28-M introduced by the US Department of Defense. It cannot be restored by software restoration and a device that reads residual magnetism.
8. US Air Force
AFSSI5020		 After overwriting the entire disk area with zero (0x00), it is overwritten with a fixed value (0xff) and a random fixed value, and finally 10% write verification is performed. It cannot be restored by software restoration and a device that reads residual magnetism.
9. US Department of Defense compliant method
DoD5220.22-M		 Overwrite the entire disk area with zeros first, then 0xff, random numbers, and finally write verification. This method is the most adopted by domestic companies and government offices. It cannot be restored by software restoration and a device that reads residual magnetism.
10. US Navy
NAVSO P-5239-26-MFM		 Write verification is performed after overwriting the entire disk area with fixed values ​​(0x01), fixed values ​​(0x7ffffff), and random numbers. It cannot be restored by software restoration and a device that reads residual magnetism.
11. US Navy Method
NAVSO P-5239-26-RLL		 Write verification is performed after overwriting the entire disk area with a fixed value (0x01), fixed value (0x27ffffff), and random numbers. It cannot be restored by software restoration and a device that reads residual magnetism.
12. Old NSA method Bit Toggle Overwrites the entire disk area four times in the order of zero (0x00), fixed value (0xff), zero (0x00), and fixed value (0xff). It cannot be restored by software restoration and a device that reads residual magnetism.
13. German standard VSITR Overwrites the entire disk area with a zero (0x00) and fixed value (0xff) pattern three times, and finally with a fixed value (0xAA). It cannot be restored by software restoration and a device that reads residual magnetism.
14. Gutman recommended method Overwrite the entire disk area 4 times with random numbers first, then 27 times with fixed values, and finally 4 times with random numbers, for a total of 35 times. This method was introduced by Peter Gutmann in 1996. It cannot be restored by software restoration and a device that reads residual magnetism.
Grades 15-16

Employee / Personal data / Confidential information / Customer data

SSD erasing method using the erasing command installed in the disk

In order to avoid misuse and unintentional operation mistakes by the user, this command cannot be executed for Serial ATA connected disks due to the specifications (restrictions) of Windows 8 or later OS. DiskDeleter makes this command available for disks connected via USB using a dedicated cable.

  • Data cannot be restored with software and devices that read residual magnetism
  • Fast erase using commands provided on SATA / IDE SSDs that cannot be restored using laboratory-level restore technology
  15. Secure Erase method A method of erasing the SSD mapping table and returning it to the factory default state. Use the commands provided by the SATA / IDE SSD to perform high-speed data erasure. Avoid wear leveling on SSDs and erase mapping tables and memory cells with zero writing. Bad sectors that have been replaced are "not erased".
16. Extended Secure Erase method Erases the data with the unique value set inside the SSD. Use the commands provided by the SATA / IDE SSD to perform high-speed data erasure. It avoids SSD wear leveling and erases mapping tables and memory cells with unique values ​​set inside the SSD. Bad sectors that have been replaced are also "erased".

 

 

Time required to erase disk data

When erasing SDD or HDD, the time required to complete the work varies depending on the hardware environment of the model (HDD seek time, memory capacity, disk capacity, etc.). Here are some of the results of our in-house verification.

 

Surface Pro (Microsoft)
Time : 8 minutes 53 seconds / 4.47 seconds per required 1GB 
Disk size : 119.2GB
memory : 3.9GB
CPU : Intel Core i5-4200 CPU 1.60GHz
Software used : DiskDeleter UX
Erase method : Grade 1 Zeri Light
Laptop (Let's Note)
Time : 15:00 seconds / 7.55 seconds per required 1GB 
Disk size : 119.2GB
memory : 7.9GB
CPU : Intel Core i5-7300 CPU 2.60GHz
Software used : DiskDeleter UX
Erase method : Grade 1 Zero Light

 

Desktop PC (made by HP)
Time : 42 minutes 33 seconds / 10.96 seconds per required 1GB 
Disk size : 232.9GB
memory : 7.9GB
CPU : Intel Core i3-2100 CPU 3.10GHz
Software used : DiskDeleter UX
Erase method : Grade 1 Zero Light
Laptop (VAIO)
Time : 24 minutes 06 seconds / 12.4 seconds per required 1GB 
Disk size : 119.2GB
memory : 3.9GB
CPU : Intel Core i3-3217U CPU 1.80GHz
Software used : DiskDeleter UX
Erase method : Grade 1 Zero Light

 

Desktop PC (no brand)
Time : 2 hours 25minutes 41 seconds / 18.76 seconds per required 1GB 
Disk size : 465.8GB
memory : 15.7GB
CPU : Intel Core i3-7100 CPU 3.90GHz
Software used : DiskDeleter UX
Erase method : Grade 1 Zero Light
Windows tablet (made by ASUS)
Time : 29 minutes 32 seconds / 30.4 seconds per required 1GB 
Disk size : 58.2GB
memory : 1.8GB
CPU : Intel Atom x5-z8350 CPU 1.44GHz
Software used : DiskDeleter UX
Erase method : Grade 1 Zero Light

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