[Vibrant Q&A, Help & Troubleshooting] Gooney Gu Gu:
Recently I bricked my Vibrant pretty seriously, I did a lot of searching and found that many people were experiencing the very same issue but few of them were able to find a solution.

I want to share exactly how I manged to get my phone restored, just in case anyone else finds themselves in the same situation.

*** PLEASE READ FULL POST CAREFULLY BEFORE PROCEEDING ***

The problem

After an Odin restore I found my phone was caught in a recovery loop and I was continually getting the following error:

E:Can't mount /dev/block/st110 (Invalid argument)

E:copy_dbdata_media:Can't mount DBDATA: copy default media content failed

The solution

Eventually I found this bit of info provided by user Windowlicker on the Samsung Galaxy S Forums.

Put your phone to download mode (hold down: volume down, home key, power)

Do not plug in your phone yet.

Start Odin3

Tick "Re-Partition", and also check that "Auto Reboot" and "F. Reset Time" have been ticked.

Click "PIT" button and select s1_odin_20100512.pit file.

Now, plug in the phone and wait until Odin finds it.

Click "Start" button... <Firmware update start...> <Get PIT for mapping...> appear. The phone will turn off and the screen indicates "Reset". Wait until Odin indicates "Pass".

Plug out your phone, remove the battery, put it back in and put phone to download mode again.

Click "Reset" button in Odin and untick "Re-Partition" box.

Do not select PIT file again. Just leave it empty.

Click "PDA" button and select "CODE" file.

Click "MODEM" button and select "MODEM" file.

Click "CSC" button and select "CSC" file.

Plug in the phone and wait until Odin finds it.

Click "Start" button and wait until phone reboots with the new software version.

(When it comes to the restore step I found that I needed to go back to the Stock 2.1 Vibrant ROM, JI2 & JI6 wouldn't work for me.)

I hope this info helps some folks out, I had completely given up on trying to restore, and I ordered a replacement from T-Mobile. A couple days later I found this solution. Now I'm waiting to receive a phone I no longer need, and will find a nice $20 delivery charge on my next TMO bill. The price of giving up too quickly I guess.

***ADDITIONAL NOTES BASED ON USER FEEDBACK***

I've noticed many people are getting stuck on the 7th step, 'where you are asked to remove the battery and place the phone in download mode'. I cannot stress enough that you need to be extremely patient during this step and should not remove the battery until after Odin indicates pass. This could take as long as 10 to 30 minutes, failure to wait could result in a 'true brick'.

Another step missing from the original instructions is to remove the External SD and SIM cards before starting this process. I'm not completely certain what the technical reason is behind this, but it does seem to help the process along.

Before starting it might also be to good make sure the screen saver and sleep modes on your PC are disabled, as some steps take a while and it might be possible for either of these processes to interrupt it.

Finally, I again want to stress patience. If during any step, things seem like they are taking longer than you think they should, go and make a sandwich, maybe play a game or watch some TV and give it a little while longer. Letting the phone sit too long during a step won't cause any problems, but removing it too soon could cause a brick.