The CFADPT7-S can be mounted where a 2.5" hard drive would fit as it has the same mounting holes and same physical size.  The CFADPT7 is available as a standard single drive or optionally a dual drive with two CF sockets.  The CFADPT7 supports newer CF cards that use DMA.  The adapters have an activity light and a push button ejector for the top drive , making it suitable for panel mounting.  The CFADPT7 adapters can be jumpered for master or slave and can get the CF power (5V at <100mA) from the 44 pin IDE connection or the on card auxilliary power connector (floppy style .1" header) when 40 pin cables are used.