Sony Mavica MCV-CD 1000 Will not recognize a new disc.

I appears to be a known issue

https://www.google.com/search?q=sony+mavica+350+disc+error

Probably need a Sony repair centre.
..

close the session on the cd with cd burning software on a PC. you'll be able to recover pictures that way.

Corrupt disk.

The camera may display a FORMAT ERROR if the inserted media is not formatted or if the media was formatted on a computer. This error may also display if the inserted media is not supported by the camera.
Please make sure that you're using either CD -R disc which does not require formatting or CD -RW disc.
If you're using any other discs like CD +RW, CD+R may arise the error message.
If the issue persists with a new different CD -R disc, service may be required for the Camera.

I'm not able to format a cd-rw 215 mb on my sony mvc-cd400, anyone know why?

No, your Camera supports only 8 cm CD-R Discs.

I have had similar problem and i think it's a problem with the disc. Make sure the disk is clean and unscratched. Check your other discs, too, to see if they are giving you the same problem. If not, it' is most likely the disc and not the camera.

SONY CYBERSHOT DSC -30 LENS WILL NOT OPEN

This camera saves images on CD-R discs. Either there is no disc inserted, its inserted upside down, or there are focus problems with its laser.

It comes when Disk not being recognized. I had the same camera before. You need to use good quality CDRs or CD-RWs. Usually Sony Mavica disks best with that camera. Maybe you cannot find Mavica in market then go for Sony, Philips, Imation miniCDR/W. also keep the lens of the internal CD writer clean. If you need further assistance please post your question

Good Luck