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2. USB mass storage device class - Wikipedia

   en.wikipedia.org/wiki/USB_mass_storage_device_class

   However, portable devices typically cannot provide enough power for hard-drive disk enclosures (a 2.5-inch (64 mm) hard drive typically requires the maximum 2.5 W in the USB specification) without a self-powered USB hub. A Windows Mobile device cannot display its file system as a mass-storage device unless the device implementer adds that ...

3. Seagate FreeAgent - Wikipedia

   en.wikipedia.org/wiki/Seagate_FreeAgent

   The FreeAgent GoFlex drives support USB 2.0, USB 3.0 (backwards compatible with USB 2.0 ports), FireWire, and eSATAp (aka eSATA/USB or powered eSATA); they are supplied fitted with an adapter for one of these standards (often USB 2.0), or none (bare drive), and additional adapters can be purchased. There are two families of adapters, one for ...

4. USB hub - Wikipedia

   en.wikipedia.org/wiki/USB_hub

   A four-port "long cable" "external box" USB hub A four-port "compact design" USB hub: upstream and downstream ports shown. A USB hub is a device that expands a single Universal Serial Bus (USB) port into several so that there are more ports available to connect devices to a host system, similar to a power strip.

5. USB hardware - Wikipedia

   en.wikipedia.org/wiki/USB_hardware

   This is common for external hard and optical disc drives, and generally for devices with motors or lamps. Such devices can use an external power supply, which is allowed by the standard, or use a dual-input USB cable, one input of which is for power and data transfer, the other solely for power, which makes the device a non-standard USB device ...

6. Hard disk drive - Wikipedia

   en.wikipedia.org/wiki/Hard_disk_drive

   Two 2.5" external USB hard drives Seagate Hard Drive with a controller board to convert SATA to USB, FireWire, and eSATA Current external hard disk drives typically connect via USB-C; earlier models use USB-B (sometimes with using of a pair of ports for better bandwidth) or (rarely) eSATA connection. Variants using USB 2.0 interface generally ...

7. Portable storage device - Wikipedia

   en.wikipedia.org/wiki/Portable_storage_device

   Most modern PSDs are dedicated solid-state drives (SSD) that are connected to a computer and powered via USB ports. Some PSDs, usually those from before the wide adoption of SSDs, are modified hard disk drives via the installation of a disk enclosure , and require an additional AC adapter as the power required to operate the drive typically ...