Below are answers to frequently asked questions about the Western Digital WD20SMZM hard drive, based on available technical information and user discussions.
Q: What is the Western Digital WD20SMZM?
A: The Western Digital WD20SMZM is a 2TB hard drive designed for use in surveillance systems and DVR/NVR recorders. It operates at 5400 RPM and uses a SATA 3.0 interface.
Q: What is the intended use case for the WD20SMZM?
A: This drive is optimized for continuous write-intensive workloads typical in video surveillance applications. It is built to handle 24/7 recording from multiple cameras.
Q: What is the storage capacity of the WD20SMZM?
A: The drive offers a total formatted capacity of 2TB (2000GB).
Q: What is the form factor and interface?
A: It is a standard 3.5-inch internal hard drive that connects via a SATA 6Gb/s interface. It is backward compatible with SATA 3Gb/s and SATA 1.5Gb/s ports.
Q: What is the rotational speed of the WD20SMZM?
A: The spindle speed is 5400 RPM.
Q: What is the cache size on the WD20SMZM?
A: This model typically features a 64MB cache buffer.
Q: Is the WD20SMZM suitable for desktop PC use?
A: While it can function in a desktop computer, it is specifically engineered for surveillance environments. Its firmware is optimized for sequential writes rather than random read/write patterns common in desktop tasks.
Q: Does the WD20SMZM support 24/7 operation?
A: Yes, it is rated for 24/7 continuous operation in a surveillance environment with a workload of up to 180TB per year.
Q: What is the mean time between failures (MTBF) for this drive?
A: The MTBF is rated at 1,000,000 hours.
Q: How much power does the WD20SMZM consume?
A: Typical power consumption is around 4.1W during read/write operations and approximately 2.5W when idle.
Q: Is the WD20SMZM compatible with RAID configurations?
A: Yes, it is compatible with most RAID environments, including those in NVR and DVR systems. It includes TLER (Time-Limited Error Recovery) to reduce drive dropouts in RAID arrays.
Q: What operating temperature range does the drive handle?
A: The operating temperature range is 0°C to 65°C (32°F to 149°F). Non-operating temperature range is -40°C to 70°C (-40°F to 158°F).
Q: What is the warranty period for the Western Digital WD20SMZM?
A: This drive comes with a 3-year limited warranty from the manufacturer.
Q: What is the physical weight of the drive?
A: The weight is approximately 650 grams (1.43 pounds).
Q: Can the WD20SMZM be used in a NAS system?
A: It is not specifically designed for general NAS use, but it can work in a NAS system dedicated to surveillance recording. For standard NAS file storage, a WD Red series drive is typically recommended.
Q: Does the drive have any special noise or vibration dampening?
A: The WD20SMZM is not marketed with advanced acoustic dampening, but it operates relatively quietly. Vibration sensors help detect minor shocks during operation to protect the data.
Q: What is the typical data transfer rate for this hard drive?
A: Sustained data transfer rate is around 150MB/s to 180MB/s for sequential reads and writes.
Q: Is the WD20SMZM a CMR or SMR drive?
A: This model utilizes Conventional Magnetic Recording (CMR) technology, which provides consistent write performance suitable for surveillance recording.
Q: What is the part number for the WD20SMZM?
A: The standard part number for this drive is WD20SMZM. Some retailers may list it under additional SKUs.