This is a Western Digital 160GB 5400RPM SATA Laptop Hard Drive.  Its model number is WD1600BEVT-00ZCT0.  This Western Digital WD1600BEVT-00ZCT0 SATA 2.5" hard drive series features durable and reliable hard disk drives with PMR technology. The SATA hard drives have a low power consumption and reduced acoustic noise, making these 2.5" 5400RPM hard drives an excellent choice for your high capacity notebook storage needs. These drives are pulled and tested from various off-lease HP laptops.