Hello! I have a problem with the flash drive, when I plug in into pc, cam read but can't format, antivirus scan but it stop after several scans, I can not write and copy / move, in some computers it read free memory and occupied memory,while in some others pc do not read anything except the name of the usb. I tried with many ways to return to their former state, but with no way it works, ranging from regedit, to write protect, to disk management to my computer, various programs for Recover and format but nothing, all is not functioning and blocked when I click the flash drive. What can you do to help? I do not want to format because I have files that i want to keep it. Thank you.
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Some possible causes (without knowing specific details of your hardware):
The USB port on a computer or USB hub has a limit how much power it can supply to the attached USB device. In some computers and hubs this is underpowered. Alternatively, some USB memory sticks require more power than others, and can actually exceed the specification for USB power: either by design or due to an electrical failure of some kind.
In some cases a USB2 port may supply far less power than the standard demands. It may need an outside power adapter to provide full power. However, even when using a USB hub that supplies an outside power adapter, the power adapter may be underpowered...and when too many USB devices are attached to the hub, the power adapter is unable to reliably supply the required power to all the USB devices. (for example, let's say you have a 5 port USB2 hub that has a power adapter than can provide 1.0Amps. That can only power 2 USB devices running at 500mA each (or 5 USB devices at 200mA each). Thus, if you have USB devices that add up to more than the 1.0Amps in total, you run into the power problem on that hub.)
Also, USB3 device can require more power than a USB2 port can provide. The USB3 port is specified to be able to deliver more power to attached devices, although a given implementation may not deliver the full rated power. Thus, a USB3 device may not get enough power from a USB2 port or USB2 hub...and it may not even get enough power from an under-powered USB3 port.
Any of these cases may cause the USB port to shut down instantly or after a short time of operation, or cause unreliable device operation.
well my flash drive is san disk Cruzer Edge 4GB USB 2.0, my laptop is with USB 3.0, 1 month before it open better and with no problems, I had some viruses and I deleted it, but when I was transferring a movie, transfer went 35% and it stoped. I plug out and then plug in, flash drive was not working more, i try to recover with may of programs downloaded from web, and programs of computer but not. tried to open in other computers with USB 1.0 and 2.0 but not i can read the files but not to copy/move, delete, or format. what can i do??