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M README.md

@@ 26,4 26,11 @@ resulting ROM.
 
 For the rest, refer to documentation in `doc`.
 
+## Accessing mass storage
+
+Initializing mass storage right at power up is tricky in terms of timing, so
+the default builds don't do it. This means that before accessing blocks, you
+need to manually initialize the target device. For SD cards, it's `sdc$` and for
+CF cards, it's `ata$`.
+
 [rc2014]: https://rc2014.co.uk