My g1 says SD card removed. Insert new one why?

SOURCE: Removed SD Card is everpresent in the notification

Your SD card is corrupted. Since it's corrupt (or worse, broken), the G1 won't be able to mount it to your computer via USB and you will have to insert it into your computer via an adapter. From there you can format the drive (make sure it's formatted fat32) and it should be fine. I've fragged my SD cards a couple of times and had to format. If you are unable to re-format the SD card, then there may have been some sort of actual, physical damage to it, although that's unlikely.

SOURCE: MY G1 KEEP SAYING INSERT THE SD CARD AND I HAVE

Does the card "read" in a computer, or other phone? There the steps to try first, Also make sure its of a capacity the G1 supports, if the card does read in another device then your phone needs looking at, maybe try a freinds card in your phone? also if your card doesnt read in other devices, then your card looks like it is faulty.

SOURCE: Where do I insert the sd card on the g1 phone

on the sd slot provided on side panel of your phone.