Looks like you caught a typo. Oops, I meant expansion.
Like many computer formats the express 34 is a standard. While the design is flaky, there is nothing we can do to improve that. That is one of the reasons we use ePCIe, because of the locking cable. Again the eSATA cable has the same issue as the express 34 cards, they can easily be removed by accident.
There is no way to tell what would happen to the RAID if the card were to come out. Most of the time it may not cause any issue, but it is possible to corrupt the data too. It really just depend on what is happening the exact second it happen. Writing being worse than reading of course.
Jared PicuneCalDigit. Serious Storage.Denver Final Cut Pro UGGeeky Mac | FCP Tips & Tricks