the drive and the controller. Add to this a standard USB flash drive can only write at between two and 10 megabytes per second, depending on quality and internal technology. This is where the class numbers letters come in. Use then the best transfer time you can hope for on, say, a two gigabyte video file is about 11 minutes and an average of three megabytes per second. Speeds on flash drives are also worse on drives that have previously held data, as the old data needs to be zeroed prior to the write, unlike a magnetic drive that only needs to flip the bits that have changed. Flash drives need to make all cell zeros except of the previous state before writing the new data. External hard drives are usually faster than flash drives at an average of 30 to 40 megabytes per second, as they, even SSDs, use different internal controller technology that is faster but more expensive, hence how flash drives are much cheaper. One last point to remember, the copy process indicator in your (41/45)
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