I've only 1 Mbps up and 8 Mbps down. Which on speed tests is about 1 & 7.45 at busy time.
Floppies were slow or very slow. If you had HDDs on both computers then almost any sort of cabled system was faster, otherwise if both computers only had floppies making a local copy was better.
A 100 Mbps LAN is slower than most 5400rpm and better HDDs made in last 10 years. A 1000Mbps LAN will certainly beat any inferior USB adaptor for IDE or SATA if both computers are decent and truly support 1Gbps.
An original Firewire can still beat USB 2.x even though 400 Mbps sounds slower than 480 Mbps USB, because overhead in USB.
On decent PCs with decent disks, there is no advantage taking out the disk and using a USB adaptor. There may be an advantage connecting the donor drive to new Mobo SATA direct.
Also a gotcha with Windows or Samba networking is that default is not case sensitive. Some filesystems may have unrelated files in the same directory only varying in case. Forbidden characters differ too, Hence Kovid's approach in Calibre to Library filenames.
I've also had Windows LAN backups fail due to an application silently creating long paths as part of keeping every version of the edited file!
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