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Discussion in 'TiVo Upgrade Center' started by ggieseke, Apr 13, 2013.
It has 20.7.4b.RC3 and I made the image myself from a 750 that I found on eBay.
I am in need of a TCD 746320 image. I upgraded to a larger drive years ago and the drive failed. After installing the original drive it won't update. I found this can only be fixed with an updated image. Can someone help me out please.
I used the mfscopy command in MFS Tools 3.32 and VirtualBox to create pre-expanded DvrBARS images for Premieres. The following images are now available, and all of them are version 20.7.4 or later.
TCD746320: 320GB*, 500GB, 1TB, 2TB, 3TB & 4TB
TCD748000: 1TB*, 2TB, 3TB & 4TB
TCD750500: 500GB*, 1TB, 2TB, 3TB & 4TB
TCD758250: 2TB*, 3TB & 4TB
* Factory drive sizes
Thanks for hanging in there and making the lives of TiVo users looking to upgrade or replace drives easier.
I noticed there is an option in settings to exclude the root partition when making backups?
Just curious, what exactly does the Tivo OS store on the root partition (specifically for a Premiere TCD746320)?
The option to exclude the alternate root partition was intended to save a little space (256MB) in the backup image. It doesn't do anything in the latest version because when they switched that partition from Ext2 to Squashfs I added a few lines of code that automatically includes it in the backup and forgot all about that option.
TiVos use two sets of boot, kernel & root partitions. When an update comes out it writes the new software to the set of partitions that's not currently in use, then switches a byte in the first sector that tells it which set to use when it reboots. That way there's always a working set on the drive in case in case something goes wrong. Note that Roamios and all later models keep the software in flash memory on the motherboard instead of the platter drive.
The root partition contains the Linux OS and all the custom TiVo software.
Roamios do too? I thought that was Bolt's, which was why you couldn't switch Drives back and forth?
Bolts put the /var and sqlite partitions on the flash drive as well. That is why you cannot swap drives in the Bolts without losing programs. When it formats a new drive, it wipes the sqlite partition in the flash which clears recording information.
Excellent explanation. That makes sense thanks for the thorough answer.
Last question, just out of sheer curiosity. Does Tivo run a mostly unmodified Linux kernel (aside from including the necessary modules/drivers tivo requires) from the public source, or is it a custom kernel they built from the ground up?
It's mostly an unmodified Linux kernel, but the main application and the MFS file system is proprietary. You can download the open source stuff from TiVo.
Edit: Looks like most of the links are dead since the Xperi takeover.
In need of TCD758250: 2TB
The promptness of your reply is beyond appreciated. How can I buy you a cup of coffee?
I have two dead TCD746320 s after a power surge.
I have 2 WD 3TB drives.
Could you please send me links to appropriate images?.
What model are these drives? They may or may not work in a Tivo.
WD3003FZEX "Black" - that's what I had around.
In reality, I dont care what size they're formatted to. Just want the Tivos back working.
Sorry, this will not work in the Tivo. It would use too much power to even boot up. The power supply is not strong enough for anything other than Green (not made any more), Red (ending in EFRX), or purple.
Look for his earlier messages. One of the first messages (I think this same thread) offers up info on making a donation via PayPal. That should do what you want to do.
This thread starts out with info on how you can donate.