To reduce the risk of data loss, the write cache is disabled by default for external drives in Windows operating systems from Windows XP, but still a write operation can take several seconds and not physically unplug the unit until it is completely finished, otherwise, the write data is lost. Although USB SPI Driver memory is not damaged, the affected files can be difficult or even impossible in some cases to recover. Deletion or formatting of file system becomes necessary in order to reuse. So the extraction must be done carefully.
On Windows systems (2000 ~ XP with Service Pack 2) with mapped network drives, it may be that when connecting USB memory the system will not show files. In that case, we must go to disk manager (diskmgmt.msc) to locate the USB drive and manually modify it and ensure proper functioning.