Martin Leese wrote:

Hi,

I am transferring an old hard disk (20 Gbyte
Maxtor D740X) from an old PC to a newer one
(Dell Dimension 3000). On the old machine
the disk was the boot drive, and so was
configured as the Master device. On the newer
machine it will be a Slave device.

I have the "Jumper, CHS, and Install Guide"
for the drive, but there are two Slave
jumper settings. These are called "Slave"
and "Slave with AC", but nowhere does the
document explain was "AC" actually is.
(There is also "Master with AC" and "Cable
Select with AC".) What is "AC"?

I can't Google at the moment because my old
PC does not have the required encryption
protocols. This is why I am trying to
upgrade.

I haven't found a Maxtor HDD that says "AC" for the 2nd set of Master,
Slave, and Cable Select settings. I did find one that mentions a
secondary setting of CLJ (Cylinder Limit Jumper) which was to accomodate
old BIOSes that couldn't handle drives larger than 32 GB ... that's
really old, like over 2 decades old. That must be a really old HDD.

https://www.seagate.com/files/static...tion_guide.pdf
Page 6

Yeah, it's for a different HDD (and Seagate acquired Maxtor back in
2006), but it shows having 2 settings for each Master, Slave, and CSel
setup. I suspect the AC setting does the same.

If you don't have anything now across the AC pins, you don't need to use
that extra setting. It won't be needed in your new setup. The extra
jumper was to limit the size of the drive.