MedicAlert, best known for its health care information bracelets, plans to offer a USB device that stores personal medical records. <A HREF="http://news.zdnet.com/2100-1040_22-5513412.html?tag=zdnn.alert">The Personal HealthKey</A> will use a USB flash drive made by SanDisk and software from CapMed, a division of Bio-Imaging Technologies. The device will work with any USB-capable computer.