Is the focus disc hub the same as drum hub - 2000 Ford Focus

to start with there are no disc brake drums. There are disc rotors and brake drums and the two are as chalk and cheese. Most disc rotors just require the removal of the wheel and ( some have retaining screws for the wheel hub) pull the rotor off the hub. Off course you will have to remove the callipers before removing the disc
Brake drums on the other hand will require the removal of the wheel and loosing off of the brake adjustment. Some again have retaining screws /bolts and may require hitting the axle flange section of the drum to allow the drum to come off the axle studs. require . I strongly recommend that you get a workshop manual relevant for your vehicle before you think about doing it yourself.

Maybe, but the bearings are also removable. You could just swap out the bearings and continue to use your hub if there is nothing wrong with your hub and drum.

2000 Ford Focus Drum Removal ProcedureIf removing the drum to service the rear brakes: (note, do not remove hub retaining nut for this procedure)
1. Raise and support vehicle
2. Release the parking brake
3. Remove wheel and tire
4. Disconnect wheel speed sensor wiring harness from wheel knuckle and floor panel.
5. Remove 4 wheel spindle attaching bolts, then the wheel hub and drum assembly from vehicle.
6. Reverse procedure to install noting the following:
a. Torque wheel spindle retaining nut to 49 ft. lbs.
b. Torque wheel/tire assembly to 94 ft. lbs.
2000 Ford Focus Drum Replacement ProcedureIf replacing the drum and wheel bearing assembly:
1. Raise and support vehicle
2. Release the parking brake
3. Remove wheel and tire
4. Remove center dust cap.
5. Remove hub retaining nut.
6. Remove drum and hub assembly. Ensure wheel speed sensor ring is not damaged when removing drum/hub (if equipped).
7. Reverse procedure to install noting the following:
a. Inspect and clean wheel speed sensor ring if equipped.
b. When tightening hub retaining nut, rotate the hub assembly in counterclockwise direction.
c. Torque hub retaining nut to 173 ft. lbs.
d. Torque wheel/tire assembly to 94 ft. lbs.
e. Adjust parking brakes as necessary.

the only difference between a disc and a drum brake is that with a disc brake is that the brake pads are being squeezed into the disc to stop and with a drum brake the brake pads are being pushed on the inside of the drum to stop the vehicle

The drum and hub are one assembly on that vehicle so you will need to remove the dust cap in the center of the drum and remove the large axle nut. The drum/hub/bearing assembly will then pull off of the spindle.

If you want to replace the drum you will either have to find one with a bearing already installed, Have your old bearing pressed out of the old drum and pressed into the new drum, or have new bearings pressed into the new drum.

When installing the new drum it is very important to tighten the axle nut to the proper spec. I can get that spec for you if you need it.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Hi, The nut can be reused 4 times before renewal is required. The tightening torque is 235 Nm. If possible rotate the assembly in the opposite direction to tighten direction whilst tightening to aviod bearing damage. This applies to both disc and drum brake set up's. Hope this helps.

don't have topaz. maybe escort will help guide you.

Section 04-02: Suspension and Wheel Hubs, Rear 1996 Escort, Tracer Workshop Manual
REMOVAL AND INSTALLATION Wheel Bearing and Hub Assembly NOTE: Wheel bearings are not serviceable and should therefore be replaced as an assembly with the wheel hub (1104).

Removal

1. Raise and support the vehicle.
   

1. Remove the wheel and tire assembly.
   

1. Remove the hub grease cap (1131) from the wheel hub.
   

1. If equipped with disc brakes, remove the rear disc brake caliper (2552) and rear disc brake rotor (2C026). Refer to Section 06-04 for the removal procedure.
   

1. If equipped with drum brakes, remove the two brake drum screws and the brake drum (1126).
   

1. Unstake the rear axle wheel hub retainer (4B477) securing the wheel hub to the rear wheel spindle (4A013). Remove and discard the rear axle wheel hub retainer.
   
2. Remove the wheel hub from the rear wheel spindle.

If they look like a smaller version of your front brakes where you can see the disc (should be shiny on the side of the disc where the pad touches the rotor) then you have disk brakes.

If it's all black, or all kinda of rusted looking and all you see is a "cap" over everything behind the rim, then it'll be a drum...

95% of the zx3's have drums
only 5% of zx3's had discs. The ones that have disc brakes, also came with traction control as part of the package.

are your brake pads squeezing the rotor? are your brakes disc or drum? in order to replace pads on disc brakes you need to unbolt the caliper. If you have drum brakes make sure your car is secured and make sure your parking brake isn't on... 

one hub easy with right tools.