You've not provided enough information to really allow for a good answer to your question.

Consider editing your post with a more appropriate subject line (one that is descriptive of yoru problem); also provide more details, such as, "what tools did you use when performing your upgrade, what version of the software is your TiVo running, how you tested your drives, etc. "

More information allows more folks to fully understand your problem and offer a potential solution...

For answers to commonly asked questions, please refer to the
InstantCake Instructions and Release Notes,
Official InstantCake Discussion Thread, and the
Official PTVnet Discussion Thread