ddrescue is not related to dd in any way except that both can be used for copying data from one device to another. GNU ddrescue is a data recovery tool capable of ignoring read errors.
Results may vary while using USB adapters. If possible, data recovery from disks should be performed using their native interface: SATA or, for older drives, IDE. See dd#Disk cloning and restore and Core utilities#dd alternatives. So, when moving data to a new drive, instead of cloning the block devices or file systems, consider creating a new file system and only copy the files (and their attributes, ACLs, extended attributes, etc.) with e.g.
Tip: Over time file systems get new features and the mkfs utilities change their defaults, but not all new features can be enabled without reformatting.
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