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How to erase one partition not all of the disk in a safe way on ubuntu

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1

I have 2 partitions, my system file, swap.. every thing is on the partition which named now (free space) because I clicked the [-] button.
The second partition is the partition where I usually store some important data in and I don't want to erase it.

What I want to do is to Erase the partition which called (free space) safely, mean if someone installed photoRec for example he will not be able to recover my old files.
I found here on this website many answers, but all of what I found guides the user to erase all of his disk; but I don't want to do that, I just want to erase one partition, because the secret data is stored there (in free space).
I don't know what is the name of this method, maybe it's replacing the free data on the partition with zeros, (I don't know but want the safest).
Another question: the hacker can't recover the files on my partition (free space) after erasing it safely even if the another partition (/dev/sda4 ntfs) is still on my device without erasing, true?

disk format safely

share|improve this question

edited Jul 14 at 5:05

PRATAP

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asked Jul 14 at 3:56

sam islamsam islam

2844 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The free space is not allocated to a partition; I see only a single partition being sda4 (ntfs). Free space is unallocated to any partition; dev sda is the physical disk itself (not a partition). I'm confused by what you see as the 'second' partition as I only see one (sda4)
  
  – guiverc
  Jul 14 at 4:07
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Me too, I don't know any thing, the only thing I know that my linux was on that free space before I clicked the [-] button.
  
  – sam islam
  Jul 14 at 4:11
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Use the space for something else (ie. make a partition there, and fill it with junk, or write 0101010 etc. on it, then something else or 1010101, then erase the partition so it' free again) - i'm still confused by your question though.
  
  – guiverc
  Jul 14 at 4:12
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Maybe the question should be: I want to make safe erase for this (free space) not for the /dev/sda4 ntfs.
  
  – sam islam
  Jul 14 at 4:13
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you because you're trying to help me guiverc, okay I made a partition there, but this is a very big space 262GB how I'll fill all of this free space? What is the best way?
  
  – sam islam
  Jul 14 at 4:19
  

  
  
  
  

 | 
show 2 more comments

1

I have 2 partitions, my system file, swap.. every thing is on the partition which named now (free space) because I clicked the [-] button.
The second partition is the partition where I usually store some important data in and I don't want to erase it.

What I want to do is to Erase the partition which called (free space) safely, mean if someone installed photoRec for example he will not be able to recover my old files.
I found here on this website many answers, but all of what I found guides the user to erase all of his disk; but I don't want to do that, I just want to erase one partition, because the secret data is stored there (in free space).
I don't know what is the name of this method, maybe it's replacing the free data on the partition with zeros, (I don't know but want the safest).
Another question: the hacker can't recover the files on my partition (free space) after erasing it safely even if the another partition (/dev/sda4 ntfs) is still on my device without erasing, true?

disk format safely

share|improve this question

edited Jul 14 at 5:05

PRATAP

6,71844 gold badges1111 silver badges4444 bronze badges

asked Jul 14 at 3:56

sam islamsam islam

2844 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The free space is not allocated to a partition; I see only a single partition being sda4 (ntfs). Free space is unallocated to any partition; dev sda is the physical disk itself (not a partition). I'm confused by what you see as the 'second' partition as I only see one (sda4)
  
  – guiverc
  Jul 14 at 4:07
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Me too, I don't know any thing, the only thing I know that my linux was on that free space before I clicked the [-] button.
  
  – sam islam
  Jul 14 at 4:11
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Use the space for something else (ie. make a partition there, and fill it with junk, or write 0101010 etc. on it, then something else or 1010101, then erase the partition so it' free again) - i'm still confused by your question though.
  
  – guiverc
  Jul 14 at 4:12
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Maybe the question should be: I want to make safe erase for this (free space) not for the /dev/sda4 ntfs.
  
  – sam islam
  Jul 14 at 4:13
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thank you because you're trying to help me guiverc, okay I made a partition there, but this is a very big space 262GB how I'll fill all of this free space? What is the best way?
  
  – sam islam
  Jul 14 at 4:19
  

  
  
  
  

 | 
show 2 more comments

I have 2 partitions, my system file, swap.. every thing is on the partition which named now (free space) because I clicked the [-] button.
The second partition is the partition where I usually store some important data in and I don't want to erase it.

What I want to do is to Erase the partition which called (free space) safely, mean if someone installed photoRec for example he will not be able to recover my old files.
I found here on this website many answers, but all of what I found guides the user to erase all of his disk; but I don't want to do that, I just want to erase one partition, because the secret data is stored there (in free space).
I don't know what is the name of this method, maybe it's replacing the free data on the partition with zeros, (I don't know but want the safest).
Another question: the hacker can't recover the files on my partition (free space) after erasing it safely even if the another partition (/dev/sda4 ntfs) is still on my device without erasing, true?

disk format safely

share|improve this question

edited Jul 14 at 5:05

PRATAP

6,71844 gold badges1111 silver badges4444 bronze badges

asked Jul 14 at 3:56

sam islamsam islam

2844 bronze badges

share|improve this question

edited Jul 14 at 5:05

PRATAP

6,71844 gold badges1111 silver badges4444 bronze badges

asked Jul 14 at 3:56

sam islamsam islam

2844 bronze badges

share|improve this question

edited Jul 14 at 5:05

PRATAP

6,71844 gold badges1111 silver badges4444 bronze badges

asked Jul 14 at 3:56

sam islamsam islam

2844 bronze badges

edited Jul 14 at 5:05

PRATAP

6,71844 gold badges1111 silver badges4444 bronze badges

edited Jul 14 at 5:05

PRATAP

6,71844 gold badges1111 silver badges4444 bronze badges

asked Jul 14 at 3:56

sam islamsam islam

2844 bronze badges

asked Jul 14 at 3:56

sam islamsam islam

2844 bronze badges

1 Answer
1

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1

The free space shown in the picture is an unpartitioned portion of the disk.

To securely erase it:

1 - Create a partition on free space and format it ext4

2 - Write randoms on all space

3 - Delete created partition

---

Here is more details for step 2 : how to write randoms on all the free space

Let's say that the partition created from free space is /dev/sda1

Option 0 : not randoms but fill with zeros

The Ubuntu gnome-disks manager have an 'Erase' option which fill with zeros

Its quite secure but there is more secure : filling with randoms

Option 1 : Fill with randoms using dd:
sudo dd if=/dev/urandom of=/dev/sda1

Option 2 : Fill with randoms using the secure deletion tool shred

If not present on the system, install it, its part of the package coreutils
sudo apt install coreutils

Usage:
sudo shred -v -n 1 /dev/sda1
option -n 1 is for 1 pass, can be increased for more security and longer process time...

share|improve this answer

answered Jul 14 at 4:50

cmak.frcmak.fr

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1

The free space shown in the picture is an unpartitioned portion of the disk.

To securely erase it:

1 - Create a partition on free space and format it ext4

2 - Write randoms on all space

3 - Delete created partition

---

Here is more details for step 2 : how to write randoms on all the free space

Let's say that the partition created from free space is /dev/sda1

Option 0 : not randoms but fill with zeros

The Ubuntu gnome-disks manager have an 'Erase' option which fill with zeros

Its quite secure but there is more secure : filling with randoms

Option 1 : Fill with randoms using dd:
sudo dd if=/dev/urandom of=/dev/sda1

Option 2 : Fill with randoms using the secure deletion tool shred

If not present on the system, install it, its part of the package coreutils
sudo apt install coreutils

Usage:
sudo shred -v -n 1 /dev/sda1
option -n 1 is for 1 pass, can be increased for more security and longer process time...

share|improve this answer

answered Jul 14 at 4:50

cmak.frcmak.fr

3,78411 gold badge1515 silver badges3131 bronze badges

add a comment
 | 

1

The free space shown in the picture is an unpartitioned portion of the disk.

To securely erase it:

1 - Create a partition on free space and format it ext4

2 - Write randoms on all space

3 - Delete created partition

---

Here is more details for step 2 : how to write randoms on all the free space

Let's say that the partition created from free space is /dev/sda1

Option 0 : not randoms but fill with zeros

The Ubuntu gnome-disks manager have an 'Erase' option which fill with zeros

Its quite secure but there is more secure : filling with randoms

Option 1 : Fill with randoms using dd:
sudo dd if=/dev/urandom of=/dev/sda1

Option 2 : Fill with randoms using the secure deletion tool shred

If not present on the system, install it, its part of the package coreutils
sudo apt install coreutils

Usage:
sudo shred -v -n 1 /dev/sda1
option -n 1 is for 1 pass, can be increased for more security and longer process time...

share|improve this answer

answered Jul 14 at 4:50

cmak.frcmak.fr

3,78411 gold badge1515 silver badges3131 bronze badges

add a comment
 | 

The free space shown in the picture is an unpartitioned portion of the disk.

To securely erase it:

1 - Create a partition on free space and format it ext4

2 - Write randoms on all space

3 - Delete created partition

---

Here is more details for step 2 : how to write randoms on all the free space

Let's say that the partition created from free space is /dev/sda1

Option 0 : not randoms but fill with zeros

The Ubuntu gnome-disks manager have an 'Erase' option which fill with zeros

Its quite secure but there is more secure : filling with randoms

Option 1 : Fill with randoms using dd:
sudo dd if=/dev/urandom of=/dev/sda1

Option 2 : Fill with randoms using the secure deletion tool shred

If not present on the system, install it, its part of the package coreutils
sudo apt install coreutils

Usage:
sudo shred -v -n 1 /dev/sda1
option -n 1 is for 1 pass, can be increased for more security and longer process time...

share|improve this answer

answered Jul 14 at 4:50

cmak.frcmak.fr

3,78411 gold badge1515 silver badges3131 bronze badges

share|improve this answer

answered Jul 14 at 4:50

cmak.frcmak.fr

3,78411 gold badge1515 silver badges3131 bronze badges

answered Jul 14 at 4:50

cmak.frcmak.fr

3,78411 gold badge1515 silver badges3131 bronze badges

answered Jul 14 at 4:50

cmak.frcmak.fr

3,78411 gold badge1515 silver badges3131 bronze badges