WD SATA and EIDE Hard Drives
umper settings determine the order in which EIDE hard drives and other devices attached to a single interface cable are detected by a computer system. On SATA hard drives, jumper settings enable or disable enterprise-level features. Setting the jumpers correctly on a hard drive requires the proper placement of a plastic-encased, metal jumper shuntover two pins on the hard drive jumper block, as shown in Figure 1.
PM2 Enabled Mode: to enable power-up in standby (power management 2 or PM2) mode, place a jumper on pins 3–4. This mode enables controlled spinup by spinup command in accordance with ATA standard and is mainly for server/workstation environments operating in multiple-drive configurations. Note: The PM2 feature is notavailable on all WD SATA drives. Important: PM2 mode requires a compatible BIOS that supports this feature. If PM2 is enabled and not supported by BIOS, the drive does not spin up and therefore is not detected by the system. OPT1: 150 MB/s data transfer speed enabled or disabled. Default setting is disabled. To enable 150 MB/s data transfer speed, place a jumper on pins 5–6. OPT2: reserved for factoryuse (pins 7–8).
Figure 1. Jumper Block Location
SATA Hard Drive Jumper Settings
WD SATA hard drives are factory set for workstation/desktop use. For enterprise storage requirements, the jumpers can be set to enable spread spectrum clocking or power-up in standby modes. WD SATA drives are shipped from the factory either with or without a jumper shunt in the spread spectrum clocking (SSC)enable/disable position (on pins 1 and 2). It is not necessary to add or remove the jumper shunt on the drive for workstation/desktop use. For enterprise storage enviroments, use the following advanced settings: SSC Mode (Default 1): spread spectrum clocking feature enabled or disabled. Default 1 setting is disabled or jumper shunt placed on pins 1–2. Removing the jumper enables the spread spectrumclocking feature. SSC Mode (Default 2): spread spectrum clocking feature enabled or disabled. Default 2 setting is disabled or no jumper shunt placed on pins 1–2. Adding the jumper to pins 1–2 enables the spread spectrum clocking feature.
Figure 2. SATA Hard Drive Jumper Settings
EIDE Hard Drive Jumper Settings
WD EIDE hard drives are factory set with Cable Select (CSEL) jumper settings. TheCSEL jumper setting protocol requires the use of a special interface cable. All hard drives in a CSEL-compliant system have the jumpers set in the same position. Not all computer systems support Cable Select. The Master/Slave jumper setting protocol must be used if a system does not support CSEL or if CSEL support cannot be determined. The Master/Slave protocol works regardless of whether or notthe system, devices, or cable selects CSEL. Some systems with legacy BIOSs lock up on initial boot or report a smaller drive capacity than the actual capacity of the hard drive. In such cases, alternate jumper settings must be used in conjunction with WD’s Data Lifeguard Tools software. Three common jumper setting configuration protocols are used for EIDE drives:
Figure 3. EIDE Single HardDrive Jumper Settings Dual Hard Drive Installations
To install your new WD EIDE hard drive with an existing hard drive or CD-ROM on the same interface cable, be sure all drives are jumpered as shown in Figure 4. Note: Not all hard drive manufacturers use the same jumper configurations. To install a new WD hard drive on the same interface cable with a non-WD hard drive, obtain jumper settinginformation from the manufacturer of the non-WD hard drive.
Single: the hard drive is the only device on the IDE interface cable. Master/Slave: the hard drive is either a Master (C:/) drive or a Slave drive in a multiple-drive system.
Cable Select (CSEL/CS): jumper settings are the same on all hard drives in a system (both single- and multiple-drive systems); however, a special CSEL...