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Quick look at info form DEll gx150 Dell Search All Dell com shows me your motherboard is useing 40 pin ATA interface. So you need to be sure the drive is set to "master" or "Slave" and plugged into the ribbon for the interface in correct order. Master is located at the end of cable, slave is in the middle of the ribbon. Drives also have jumping pins that need to be set for Master and slave. There is a difference from one manufacturer to another. But the info is on the drive itself most time. Look close at the label on the drive for the settings for slave mode.
Most CD or DVD drives installed in modern computers have a group of short jumper pins on the rear of the drive that determine the master or slave setting for the device. The master or slave setting helps to identify the drive when it shares a connector cable inside the computer with another device, such as a hard drive or even another optical drive. Without the master or slave jumper setting, the computer would not be able to tell one device from another or from which drive to retrieve or write data. Configuring a CD drive as master or slave is a relatively simple task that takes only a couple of minutes. Turn the CD drive so that you view the rear of the unit, then check the position of the jumper covers on the set of pins next to the power adapter plug. If the CD drive will be the only device on the IDE data ribbon cable, set the jumper cover on the two pins farthest away from the power connector. This position is the master drive setting, and, by default, most CD drives ship with this configuration. In most cases, if the CD drive is the only device connected to the cable, you do not need to change the jumper setting. Determine if you need to change the CD drive jumper setting if the device will share a connector cable with a hard drive or another optical drive. If the CD drive will be the primary (master) device on the cable, do not change the jumper setting. If the CD drive will be the secondary (slave) device on the cable, continue to the next step to change the setting. Use a pair of needle-nosed pliers or your fingers to remove the jumper cover from the CD drive if the unit will be the secondary device on the IDE ribbon cable. Set the cover over the pair of pins next the pair from which you removed it, then press it until it completely covers the pins. The jumper is now in the slave setting position.
Where it states Dual Master is the setting for the Master harddrive. Where it states Dual Slave is the setting for the Slave harddrive.
Look at the label on your harddrive, and see if it shows the settings for Master. If not write down the Model Number, and search it online. OR, post the Model Number in a Comment, and I'll look it up for you.
It may be where there is NO jumper used on the Master harddrive.
Look up the information for the 2nd (Slave drive) harddrive, if it is not stated on the label.
You need to know where the jumper pin settings should be, when using two harddrives.
Past this point you need to look at the flat ribbon cable. There are IDE ribbon cables that have 40 wires, and 80 wires. Both styles have 40 contact pins. (39 actually. 1 is not used)
With the 40 wire IDE cable the Master harddrive is plugged into the MIDDLE connector, on the cable. The Slave drive is plugged into the END connector.
With the 80 wires IDE cable, it is reversed. Master harddrive goes to the END connector, Slave drive goes to the MIDDLE connector.
I assume you are looking to connect another hard drive in your computer.
Most desktop computers have two IDE controllers.
The 1st controller will have the "C" drive set to Master (MA) and there maybe another drive CD or DVD drive on the same IDE cable, if so the drive will be set to Slave (SL) or if you intend to install a drive on this cable.
The 2nd. IDE controller and cable can have hard drive or CD/DVD drives too but the drives must be set to either Master or Slave - BOTH drives in the one cable CANNOT be set the same.
Most CD/DVD drives have a label showing the jumper setting for Master (MA), Slave (SL)and Cable Select (CS).
You only need a single jumper and it is inserted in a vertical position. There are a group of 6 pins (3 columns of 2 pins) next to the 40 pin IDE connector. The Slave setting is usually the middle set of pins.
Maxtor jumper as follow:
looking at the connector top row 5 pins, buttom row 4 pins.
the single pin on the top row is index pin.
master jumper is located between top 2nd pin and 1st buttom, counting from the left.
slave has no jumper on any of the pins.
cable select jumper is located between top 4th and buttom 3rd pin. counting from the left.
(Master) - The vertical jumper over the J50 pins is configuring the drive as a Master. The horizontal jumper over the J48 and J46 pins is in the Storage position.
(Master with CLJ) - The vertical jumper over the J50 pins is configuring the drive as a Master. The vertical jumper over the J46 pins is in the Cylinder Limitation position (CLJ).
(Slave) - No jumper is required to configure the drive as a Slave. The jumpers over the J48, J46, J44 and J42 positions are both in the storage position.
(Slave with CLJ) - The jumper over the J44 and J42 positions is in the storage position. The jumper over the J46 pins is in the Cylinder Limitation position (CLJ).
(Cable Select) - The jumper over the J48 position is configuring the drive for Cable Select. The jumper over the J44 and J42 pins is in the storage position.
(Cable Select with CLJ) - The jumper over the J48 position is configuring the drive for Cable Select. The jumper over the J46 pins is in the Cylinder Limitation position (CLJ).
Jump? Ha! Never heard that term. How about boot? Nowadays people just load drives as Cable Select; it should have worked with the old drive set to Master, but try to set them both to that and try again, or boot to a LiveCD or the drive utility disk so you can configure them on that. If they don't appear correctly in the BIOS, just double-check that power and data cables go to each drive, etc. You may need to follow the BIOS instructions or enter the BIOS controls by hitting DEL or F10 on powering up until the menu appears; then you can select the drive to try to boot first, etc. and save your settings.