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Serial access requires far fewer electrical connections for the memory chips than does parallel access, which has simplified the manufacture of multi-gigabyte drives.
Computers access modern flash memory systems very much like hard disk drives, where the controller system has full control over where information is actually stored.
Altering the contents of a particular memory location involved copying the entire field into an off-chip buffer memory, erasing the field, modifying the data as required in the buffer, and re-writing it into the same field.
Most flash drives use a standard type-A USB connection allowing connection with a port on a personal computer, but drives for other interfaces also exist.
M-Systems, an Israeli company, were granted a US patent on November 14, 2000, titled "Architecture for a [USB]-based Flash Disk", and crediting the invention to Amir Ban, Dov Moran and Oron Ogdan, all M-Systems employees at the time.
The patent application was filed by M-Systems in April 1999.
Typically, one of these ICs provides an interface between the USB connector and the onboard memory, while the other is the flash memory.
Drives typically use the USB mass storage device class to communicate with the host.