The Western Digital Caviar Green Internal Hard Disk Drives can offer 1.5 terabytes of storage at disk speeds of 7200 revolutions per minute. This internal hard drive can fit snugly on 3.5 inch bays and can connect via a 3 gigabits per second 7 pin serial advanced technology attachment connector that comes with the package. It has a 32 megabyte cache (or buffer) size and its rotational speed is regulated. It has a feature that can give the drive a data transfer performance of 3 gigabits per second buffer to host and a 100 megabits per second host to/from drive. Western Digital Caviar Green hard drives are capable of approximately 300,000 load and unload cycles for their entire service year. They are compatible with both Mac and Windows operating systems.This reliable WD15EADS Western Digital Internal Drive features reduced power consumption by up to 40%. This is because of its advanced IntelliPower, IntelliSeek, and NoTouch advanced technologies. IntelliPower is a fine tuned balance of transfer rate, spin speed, and caching algorithms. It is designed to deliver solid performance as well as significant power savings. IntelliSeek can calculate the optimum seek speeds in order to lower energy consumption, vibration, and noise. Its NoTouch ramp load technology can ensure that the recording head never touches the media. This can mean a lot less wear is incurred to the recording head and media. This Green Hard Drive can also deliver better drive protection during transit. It has a SATA 3Gb/s Interface and a seven pin Serial ATA Connector Type. It also has a serial ATA-300 Storage Interface. It is compliant with the RoHS standards as well.This reliable WD15EADS Green Caviar Western Digital device can feature an average drive energy savings of four to five watts. This can make it possible to build systems with high capacities and the right balance of system performance. It can also deliver energy conservation as well as ensured reliability.This Green Caviar WD15EADS product features Perpendicular Magnetic Recording in order to achieve greater areal density. It also has StableTrac, which is a motor shaft that is secured at both ends to reduce system induced vibration. This shaft can help to stabilize platters for accurate tracking during read and write patterns for 2TB models. Low energy spin up means that WD15EADS Drives can consume less current during startup, which allows for lower peak loads. The WD15EADS has an integrated and advanced powerful technology for optimized efficiency. This enables it to deliver low energy usage for reduced power requirements and increased durability.This Western Digital Hard Drive has advanced Green Technology. It can yield very low operating temperatures for increased reliability. It has very low acoustics for ultra quiet PC and external drive efficiency. It has a massive capacity of up to 2TB to keep up with storage intensive programs like Windows Vista. Western Digital Hard Drives can be perfect for the energy conscientious consumer. Its dimensions are 5.8 inches in depth by 4 inches in width by 1 inch in height. This product weighs 1.6 pounds. It is sleek and stylish and can compliment any décor. It is also compact and can be ideal for any space, big or small.