Flash storage or removable media.

What is the collective noun for thumb drives, micro SD card, flash drives, and similar data storage devices?

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There is no formal or traditional collective noun (like a "flock" or "herd") for thumb drives, micro SD cards, and flash drives, but they are technically grouped together as flash storage or removable media. [1, 2]

General Terms

Flash Storage: Devices that use electronic flash memory chips to save data without any moving parts.
Removable Media: Portable hardware items you can easily plug in, remove, and move between different computers or gadgets.
Solid-State Storage: A broader technical category for any device using solid-state memory chips, which also includes larger solid-state drives (SSDs). [1, 2, 3]

Common Types

USB Flash Drives: Also called thumb drives, jump drives, or pen drives.
Memory Cards: Includes micro SD cards, SD cards, and compact flash cards used in phones and cameras.