Mount and repair disk not recognized (Timed out waiting)
A &quot;time out&quot; means that a command was sent and the system is waiting for a response but didn't get one. Instead of waiting forever, a period of time is hard coded into the utility (diskutil) to wait and once it's reached, it generates the error.
Also, when you see &quot;invalid request&quot; as a response from your disk it means that the controller didn't understand what was supposed to be very much valid.  These two conditions are indicative of a failing (or failed) hardware.
If you have a failing component like the SATA controller on the drive (it's what bridges the SATA interface on the logic board to memory modules in the SSD), you'll never get it working. It may be intermittent where it works for a while but then fails again.  It's like having transmission where all gears but one have some broken teeth on them. You can change the fluid all you want and reprogram the transmission computer, but it won't fix the broken part(s). You might get it working (the unbroken teeth on the gears line up), but hardware failures are pretty much permanent; it'll fail again.
What will happen is you'll have a nice clean &quot;fixed&quot; drive ready to fail at the worst moment. It's better to just spend the $40-60USD and get a new drive and have the piece of mind your data is not at risk.
Possible Recovery
You might still be able to recover the data, but I don't advise doing it on the device itself.  Instead, make an image of the drive and work off of that.   You will need:

A working MacBook that one with a new SSD and clean install is fine.  You can also use a friends.  One that you can leave alone for a while to do recovery operations

A USB3 to SATA cable. This will allow you interface with the drive without having to open up a Mac to connect it to the SATA bus.  Ideally, you want USB3 for the higher transfer speeds.  You can use USB2, but it will take considerably longer.

Recovery Software like DiskDrill (I've used this personally with very good success) or Disk Warrior (other have reported success).  The diagnostic features of these utilities are free so you can use them to see if the data is recoverable. If you want to recover the data, you can purchase a license key that will unlock it.  If you're data isn't recoverable then you're not out any money.


You want to work on an image instead of the device itself.  Stressing out the drive can only compound the problem. It's like our transmission with broken teeth on the gears - continuing to run it will only make it worse, not better.  Same with electronic components - there may be no more spinning drives, but passing electric current, which generates heat through failing components isn't doing them any favors.
You can use the built-in dd command to make an image.
$ sudo dd if=rdiskX of=/path/to/disk.img bs=4M

This will make an image of your drive wherever you decide to put it (i.e. your Desktop - ~/Destktop/disk.image).  Then run your recovery software on the image.  Note:  This is a &quot;set it and forget it&quot; type of operation so, it's going to take some time.  But, once you have the file, you'll be able to copy it and move it and do your operations on it without running the risk of further data loss.