Black Laptop Briefcase

Why black box/flight data recorder are not made to float?

In the Air France crash, they found bodies, briefcases and a laptop floating. Why can't they make the black boxes so they float? It should be easy to make with a chemical that slowly reacts with water and in 24 hours produce enough gas to make it float.

This link will surely help you...
be sure to visit...
it's so huge that i cannot put the whole stuff here...
anyway i'll jus give some selected components to help you out...
first of all you cannot make it possibly float because it has so many components integrated together...
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These early devices used magnetic tape for data storage, much like that used in a tape recorder. As the tape is pulled over an electromagnetic head, sound or numerical data is recorded on the medium. Analog black boxes using magnetic tape are still present aboard many planes, but these recording devices are no longer manufactured. Newer recorders instead use solid-state memory boards, called a Crash Survivable Memory Unit (CSMU), that record data in a digital format. Instead of the moving parts present in older recorders, solid-state devices use stacked arrays of memory chips similar to a USB memory stick. The lack of moving parts eases maintenance while reducing the chance of a critical component breaking in a crash. Solid-state recorders can also save considerably more data than older magnetic tape devices and are more resistant to shock, vibration, and moisture.
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The Flight Data Recorder collects data from a number of sensors to monitor information like accelerations, airspeed, altitude, heading, attitudes, cockpit control positions, thermometers, engine gauges, fuel flow, control surface positions, autopilot status, switch positions, and a variety of other parameters. Most parameters are recorded a few times per second but some FDRs can record bursts of data at higher frequencies when inputs are changing rapidly.
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Power for the black boxes is provided by electrical generators connected to the engines. The generators on most large airliners produce a standard output of 115 volt, 400 hertz AC power while some smaller planes instead generate 28 volt DC power...
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http://www.aerospaceweb.org/question/investigations/q0302.shtml

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