# Seagate F3 Head Resistance Test
# Tests read/write head resistance on a Seagate F3 drive.
# Run at level 7 with the X command.
# Default baud: 38400, 8N1, no flow control.
#
# Head resistance values are displayed as hex for each head.
# Normal range varies by family, but values significantly
# higher or lower than others may indicate a damaged head.

echo "============================================"
echo " Seagate F3 Head Resistance Test"
echo "============================================"

if $gui_mode = 0
  serialopen /dev/ttyUSB0 38400
else
  serialopen
endif
usleep 200000

echo "Waking terminal (Ctrl+Z)..."
serialsend \x1a
usleep 500000

echo "--- Terminal Banner ---"
buffersize 1024
serialread 1024
printbuffer 0 1024

echo "Changing to level 7..."
serialsend \x2f\x37\x0d
usleep 300000

echo "--- Level Change ---"
serialread 1024
printbuffer 0 1024

echo ""
echo "Running head resistance test (X command)..."
serialsend \x58\x0d
usleep 500000

echo "--- Head Resistance Results ---"
serialread 2048
printbuffer 0 2048

echo ""
echo "Returning to level T..."
serialsend \x2f\x54\x0d
usleep 200000

echo "--- Level T ---"
serialread 1024
printbuffer 0 1024

echo ""
echo "============================================"
echo " Head resistance test complete."
echo " Each head shows a hex resistance value."
echo " Compare across heads -- outliers may be bad."
echo "============================================"

if $gui_mode = 0
  serialclose
endif
echo "=== Done ==="
end