The **M3H54FDD-R** refers to a high-capacity, high-performance solid-state drive (SSD) part number, typically associated with Samsung’s PM1643a or PM1643 series enterprise SAS drives. These components are designed for data center environments requiring high endurance and reliability. --- ### 1. Technical Specifications Below are the primary electronic and performance characteristics of this component series: | Feature | Specification | | :--- | :--- | | **Interface** | SAS 12.0 Gbps (Dual Port) | | **Form Factor** | 2.5-inch (Small Form Factor) | | **NAND Type** | Samsung V-NAND (TLC) | | **Capacity Class** | Typically 3.84TB or 7.68TB (Varies by suffix) | | **Sequential Read** | Up to 2,100 MB/s | | **Sequential Write** | Up to 1,700 - 2,000 MB/s | | **Endurance** | 1 Drive Write Per Day (DWPD) | --- ### 2. Key Electronic Sub-Systems #### A. Controller and Firmware The drive utilizes a proprietary Samsung multicore controller. This "brain" of the SSD manages: * **Wear Leveling:** Ensuring data is written evenly across NAND cells to prevent premature failure. * **Error Correction Code (ECC):** Detecting and fixing bit-level errors caused by electronic interference or cell degradation. #### B. V-NAND Flash Memory The "M3H..." part identifies the specific density of the 3D V-NAND stack. Unlike traditional flat (planar) NAND, V-NAND stacks cells vertically, which: * Reduces electrical interference between cells. * Increases power efficiency. * Provides higher data density in a small physical footprint. #### C. Power Loss Protection (PLP) This part includes an array of **Tantalum capacitors**. In the event of a sudden power failure, these capacitors provide enough residual energy to: 1. Flush the DRAM cache data into the non-volatile NAND. 2. Prevent data corruption and ensure the mapping table is saved correctly. --- ### 3. Interface and Compatibility The **SAS (Serial Attached SCSI)** interface distinguishes this from consumer SATA or NVMe drives. * **Dual Port Support:** The drive can connect to two controllers simultaneously, providing a redundant path for high-availability enterprise servers. * **Full Duplex:** Unlike SATA, SAS can send and receive data at the same time. --- ### 4. Part Number Breakdown (Generic) While internal manufacturer codes are proprietary, the string generally follows this logic: * **M3:** Memory module/SSD category. * **H5:** Density/Capacity identifier. * **4F:** Controller version or NAND generation. * **DD-R:** Specific revision and RoHS compliance/packaging type.