How to fix MAC OS Hard Drive formatting issue 2018 - 2021

This is a tutorial on how to force your hard drive to reformat in MAC OSX high sierra (possibly earlier versions)

diskutil list

diskutil unmountDisk force disk4

sudo dd if=/dev/zero of=/dev/disk4 bs=1024 count=1024

[serinafallingstar]

I want to thank you so much ! I thought I was going to lose my hard disk but you saved my life, thank ! 💛

[giovannimendez]

When i put the sudo dd if=/dev/zero of=/dev/disk4 bs=1024 count=1024 my mac says sudo:command not found

[yakirdamti]

Hey, I received an error that my permission denied what can I do to fix that?

[danielprenticeproductions]

It says the forced unmount was successful but I'm still getting an error on the third command

[nuriasilva]

"Input/output error" what do i do?

[spectaculardesing]

Good evening! I have disk 0.
I have a 2019 Catalina. Is it okay for me to
do this?

[shikhab]

This is quite an old video not sure if anyone will answer but can somone please explain why you are writing all zeros to the external flash drive?(i think this is what that dd command is doing unless i am wrong)

[FadzliRealtor]

I am trying to reinstall after deleting it previously for a new owner for my laptop. Now I want to install the OS. It keeps on giving me error saying "an error occurred when preparing the installation".

Changed the date and time still nothing.

So I am trying to start from the beginning by erasing everything again. APFS is greyed out. When I choose Mac OS extended journaled, it gives me an error.

[swoyammanandhar]

Please reply. I really need help. I did exactly what you said but now the disk is unreadable. I was doing it to only a partition of the disk but the whole disk is unreadable. Before I did the last step, at least the other partition used to show up but now it doesn’t. Please help!!!

[gurmeetchahal]

Hi bro, I did as you said but after shows error/ couldn’t open device (69877)

[oatiko]

I've tried force unmount with terminal and disk utility but I am still when erasing it seems to get stuck on "Waiting for partition to activate".

[janulkamizu]

New error occurred after doing your tutorial and now the disc is not visible anymore. Some tip? It is brain new WD elements 2T so no data on it. I tried to use it for time machine and during the formatting it failed and since that it is not working.

[FlecissaVideos]

dd: /dev/disk2: Input/output error
1+0 records in
0+0 records out
0 bytes transferred in 0.012877 secs (0 bytes/sec)


it also shows UNABLE TO WRITE LAST BLOCK OF ...

[ajazshaik]

Erasing “Samsung PSSD T7 Media” (disk4) and creating “500GB SSD”

Unmounting disk
Creating the partition map
Wiping volume data to prevent future accidental probing failed. : (-69825)

Operation failed…
Still getting this can you help

[lifeofarely]

I had tried everything and was ready to return my hard drive until I came across this video!!! thank you so much

[alykofi]

What to do when I try to erase disk0s2 it says volume erase failed file system formatted failed

[DanialVlogs]

you are a ı was struggling for this from hours and saw alot of videos but nothing happend. and finally u solved it love uuuu

[rodriguinhojp]

"operation not allowed"
how to proceed?

[tinosterling]

Thank you a million.... 6years after and still works.. .Thanks!!!!

[iristang]

I have tried to copy your 1st and 2nd also can but the 3rd link cannot be done.