After getting my Raspberry Pi I used the one built-in on my MacBook Pro, but the SanDisk SDHC-card showed up as read-only in finder on my mac, and Disk Utility refused to format it. The write protection switch on the card was correctly set, so that made me a bit baffled. But it seems that the internal card reader on the MacBook Pro is a bit finicky.
Getting your MacBook to Make SD-Cards Writable
The trick to getting the reader to see the card as writable, you need to put the write protection switch on your SDHC or SD-card in the middle because the sensor in the card reader is flaky. After doing that, the card shows up as writable. So now I have my Raspberry Pi up and running with RaspBMC, and I’m a happy dude!
More articles on Raspberry Pi are coming!