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  2. Aquifer test - Wikipedia

    en.wikipedia.org/wiki/Aquifer_test

    Aquifer testing is a common tool that hydrogeologists use to characterize a system of aquifers, aquitards and flow system boundaries. A slug test is a variation on the typical aquifer test where an instantaneous change (increase or decrease) is made, and the effects are observed in the same well.

  3. USB flash drive - Wikipedia

    en.wikipedia.org/wiki/USB_flash_drive

    Having this second space allows the manufacturer to use a single printed circuit board for more than one storage size device. USB connector cover or cap – reduces the risk of damage, prevents the entry of dirt or other contaminants, and improves overall device appearance. Some flash drives use retractable USB connectors instead.

  4. SD card - Wikipedia

    en.wikipedia.org/wiki/SD_card

    To use an SDIO card as a "combo card" (for both memory and I/O), the host device must first select four-bit SD bus operation. Two other unique features of Low-Speed SDIO are a maximum clock rate of 400 kHz for all communications, and the use of Pin 8 as "interrupt" to try to initiate dialogue with the host device.