M2 SSD to SATA SSD: ~500 MB/s and ~10MB/s USB drive to SATA SSD: ~110 MB/s and ~10 MB/s (USB drive is HDD, so 110MB/s is good) Speeds switch between two values: (ignoring the initial burst of cached speed). After a while, the disk usage automatically drops to a low value and the transfer speed goes back to the previous fast speed. This causes the transfer speed to slow down to about 10 MB/s. Then suddenly the disk usage on the internal destination disk will go to 100%, regardless of which drive it is. Initially, the disk usage is low and the transfer speed fast, limited by the slowest disk/ interface. This is blazingly fast, so the problem occurs after a significant amount of data has been transferred, but it is there. This cycle repeated until the file transfer was finished.Īt first I thought it was the USB HDD, but then I tried with the M2 SSD.
DROPCOPY IOS FULL
After running at the slow speed for about a minute, it sped up again to full speed.
When I copied the files I had backed up to the external USB drive back to the new SSD drive, the file copy stared off fine, but then unexpectedly slowed down after a few tens of seconds. I copied everything from the HDD to an external USB drive, then physically replaced the HDD with the new SSD and formatted it using Manage-> Disk Management. Mass file copy speed starts fast but slows down, then fast again The effect is discussed in this forum post. It is possible that Windows 10 version 1903 may lose speed when copying files after 10 seconds. So I'll post it in the blog for information. has brought this possible problem in Windows 10 Version 1903 to my attention (thanks for that).
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