gtd4242 wrote:
Any ideas on what else to check? I don't like the thought of just swapping heads, without having a good reason to do so.
small things to try:
1) check firmware modules
2) screw/unscrew head'screw
3) try forward/back direction
4) decrease block size also help to leave less occupied the hard drive data flow to any data exctractors.
anyway i usually do this after have tried all that up: read with the first set of heads using the most fast heads, swap again and read with the others heads, if necessary swap it again ( maximum personally i reached 4 swaps to read at medium speed an hard drive, but it need many donor parts and customer must understand it )
cheers.