NVMe Drives

PCIe M.2 SSDs | MTE255S Exhibiting more than just ultra-fast speed, Transcend's PCIe SSD 255S delivers unmatched performance and exceptional stability, making it an ideal choice for advanced video editors, gamers, and software engineers. Built with a PCI Express® Gen 4 x4 interface, 3D NAND flash, and a multi-channel controller, the Transcend PCIe SSD 255S offers powerful performance in the palm of your hand. Superior Performance That Meets Your Needs Transcend's PCIe SSD 255S complies with the latest NVMe 1.4 standard, supporting the PCIe™ Gen4 x4 interface. Its multi-channel controller delivers sequential R/W speeds of up to 7,400/6,500 MB/s, and IOPS up to 700K, delivering captivating performance and response times for desktops and laptops like you've never seen before! Level Up With PCIe 4.0 Transcend's PCIe SSD 255S features the new PCIe 4.0 specification and is downwards compatible with PCIe 3.0. PCIe 4.0 unleashes a higher transfer speed for your computer and guarantees lower system latency. For content creators and gamers, this means a more seamless and immersive experience! As Cool As Always Transcend's PCIe SSD 255S has an integrated ultrathin graphene heatsink to improve heat dissipation. The high conductivity of graphene cools the system down quickly, ensuring stable device performance and reliability..Internal drive type for a reliable and convenient storage solution.Store as many documents, pictures and videos as you need with 1 TB capacity.PCI Express NVMe 4.0 x4 interface for a speedy data transfer to ensure maximum efficiency.M.2 2280 form factor for your convenience and simplicity of usage

HP SSD EX900 M.2 delivers compact storage and optimized performance for traditional and innovative small-form-factor and embedded platforms. By combining advanced NAND flash controller with PCIe Gen3 (8GB/s) x4, NvMe 1.3 interface, and 3D NAND flash, PCIe M.2 delivers sequential read speed up to 2100MB/s and sequential write speed up to 1500MB/s, which makes it an ideal solution for computing devices, such as notebooks, thin-and-light systems, mini- and sub-notebooks, all-in-one computers, and embedded platforms..Provides up to 2100MB/s read speed and up to 1500MB/s write speed.Memory capacity: 500GB, based on 3D NAND TLC memory technology.Utilizes a cost-effective, high-performance PCIe-to-NAND controller.Dimensions: 0.87"H x 3.15"W x 0.08"D; comes in M.2 form factor.Supports the Security Mode command set, which consists of: Set Password, Unlock, Erase Prepare, Erase Unit, Freeze Lock, Disable Password.3.3V M.2 SSD power supply; power consumption idle: 680mW (TYP), max: 3.52W (TYP).SSD connects through PCIe Gen3 x4, NVMe 1.3.The NANDXtend ECC technology of this solid state drive greatly enhances the durability and data storage ability of NAND, meeting the expectation of workers with high demands.Backward compatible to PCIe Gen2 and Gen1.Meets or exceeds FCC, cTUVus standards.3-year manufacturer limited warranty

Durable SSDs Built for Demanding Caching Workloads Synology SNV3410/3510 NVMe SSDs are designed to handle tough caching workloads in a 24/7 multi-user environment. Their consistent I/O performance boosts system responsiveness and speeds up handling of frequent access data. Purpose-built for Synology systems, the NVMe solid-state drive line provides a streamlined storage experience while minimizing service disruptions. SNV3410/3510 comes with advanced lifetime analytics and is backed by Synology's 5-year limited warranty. Consistently Fast Caching for 24/7 Environment Built for system cache, Synology SNV3000 series pushes up random I/O performance and reduces latency in demanding 24/7 environments. It provides a durable caching experience with over 375,000/70,000 4K random read/write IOPS and a 988 TBW endurance rating, suitable for multi-user environments, multimedia post-production, and database applications. The SNV3000 series comes with two form factors, SNV3400 for 2280 and SNV3500 for 22110. It allows you to build a highly efficient storage system with exceptional performance, without sacrificing any 3.5" drive bays. Data Integrity Safeguards SSD cache boosts your system's read/write performance by storing transient data in solid-state drives to increase retrieval efficiency and cut down recurring requests to the primary storage. Data integrity is important, as cached data are continuously relocated. Synology SNV3000 series integrates end-to-end data protection to safeguard data integrity over the entire transfer path. The SNV3500 comes with power loss protection circuit design, further preventing data corruption during an abnormal shutdown: Dedicated capacitors provide power to flush data-in-flight into NAND flash in a power loss event and firmware is designed to enable a correct restart on the next power-up. Lifetime Analytics Based on Your Workload Full integration with Synology's DiskStation Manager (DSM) operating system allows Synology systems to provide lifetime analytics based on actual workloads for each unit in SNV3000 series. Timely notifications allow you to plan further ahead for uninterrupted system performance and longevity. Easy monitoring allows you to make optimal use of each SSD. Purpose-Built for Synology Systems Firmware versions and component changes can over time cause SSD compatibility issues. Synology SNV3000 series is thoroughly tested for compatibility with our systems following each engineering change, while firmware and component changes are strictly managed. Intensive I/O stress, power cycling and temperature trials ensure that all products meet our strictest standards for quality and reliability..Internal drive type for a reliable and convenient storage solution.With a capacity of 400 GB, you have large storage space for all your documents and data.The high-read speed of 3000 MB/s maximizes system performance and saves time while you are doing complex tasks.With the high-write speed of 750 MB/s, get a quick response when updating or transferring files

Tough, fast, and compact. The rugged T7 Shield SSD is built to endure with the space to create, thanks to an IP65 rating for dust and water resistance. Transfer massive files in seconds: USB 3.2 Gen 2 and PCIe NVMe achieve soaring sequential read and write speeds up to 1050MB/s and 1000MB/s, respectively, allowing you to edit directly from the drive. The high-tech rubber exterior with Dynamic Thermal Guard controls heat to maintain steady performance for even giant projects. Ready for the rough and tumble: shoot on location and wander the wild while feeling confident your data is securely protected from water and dust with the IP65 rating. The rugged design and advanced outer elastomer add extra durability to even endure a 9.8' drop. The T7 Shield is compatible with Windows, macOS, and Android devices, gaming consoles, and more. Included in the box are USB Type-C to USB Type-C and USB Type-C USB Type-A cables for added convenience. A 2TB capacity gives you colossal space in a sleek colorway. The stylish rubberized grip prevents slips, so the SSD stays in your hands. Bring everything with you, and look great doing it. Experience the outstanding performance and reliability you expect from Samsung: all firmware and components, including Samsung's world-renowned DRAM and NAND, are produced in-house, allowing end-to-end integration for quality you can trust..External solid-state drive with USB 3.2 and PCIe NVMe interface.Provides sequential read and write speeds up to 1050MB/s and 1000MB/s, respectively, allowing you to edit directly from the drive.Memory capacity: 2TB.Compatible with Windows, macOS, and Android devices, gaming consoles, and more.Keep personal files and confidential data restricted from hackers and thieves with 256-bit AES encryption.Shoot on location and wander the wild while feeling confident your data is securely protected from water and dust with an IP65 rating.Powered via USB.Connects through USB 3.2 Gen 2.Rugged design and advanced outer elastomer add extra durability to even endure a 9.8' drop.Dynamic Thermal Guard controls the heating of the drive and protects the drive from overheating.Meets or exceeds the CE, BSMI, KC, VCCI, C-tick, FCC, IC, UL, TUV, CB, EAC, UKCA, BIS, and RoHS2 standards.Dimensions: 2.32"H x 3.46"W x 0.51"D.3-year manufacturer limited warranty

Tough, fast, and compact. The rugged T7 Shield SSD is built to endure with the space to create, thanks to an IP65 rating for dust and water resistance. Transfer massive files in seconds: USB 3.2 Gen 2 and PCIe NVMe achieve soaring sequential read and write speeds up to 1050MB/s and 1000MB/s, respectively, allowing you to edit directly from the drive. The high-tech rubber exterior with Dynamic Thermal Guard controls heat to maintain steady performance for even giant projects. Ready for the rough and tumble: shoot on location and wander the wild while feeling confident your data is securely protected from water and dust with the IP65 rating. The rugged design and advanced outer elastomer add extra durability to even endure a 9.8' drop. The T7 Shield is compatible with Windows, macOS, and Android devices, gaming consoles, and more. Included in the box are USB Type-C to USB Type-C and USB Type-C USB Type-A cables for added convenience. A 1TB capacity gives you colossal space in a sleek colorway. The stylish rubberized grip prevents slips, so the SSD stays in your hands. Bring everything with you, and look great doing it. Experience the outstanding performance and reliability you expect from Samsung: all firmware and components, including Samsung's world-renowned DRAM and NAND, are produced in-house, allowing end-to-end integration for quality you can trust..External solid-state drive with USB 3.2 and PCIe NVMe interface.Provides sequential read and write speeds up to 1050MB/s and 1000MB/s, respectively, allowing you to edit directly from the drive.Memory capacity: 1TB.Compatible with Windows, macOS, and Android devices, gaming consoles, and more.Keep personal files and confidential data restricted from hackers and thieves with 256-bit AES encryption.Shoot on location and wander the wild while feeling confident your data is securely protected from water and dust with an IP65 rating.Powered via USB.Connects through USB 3.2 Gen 2.Rugged design and advanced outer elastomer add extra durability to even endure a 9.8' drop.Dynamic Thermal Guard controls the heating of the drive and protects the drive from overheating.Meets or exceeds the CE, BSMI, KC, VCCI, C-tick, FCC, IC, UL, TUV, CB, EAC, UKCA, BIS, and RoHS2 standards.Dimensions: 2.32"H x 3.46"W x 0.51"D.3-year manufacturer limited warranty

HPE NVMe High Performance Mixed Use (MU) Solid State Drives are ideal for Big Data analytics, cloud computing, high performance compute, business intelligence, database applications and virtualization..Hot-swap solid-state drive features PCI Express interface.SSD provides 7100MBps read speed and 2500MBps write speed.Memory capacity: 1.6TB.Form factor: 2.5" SFF.Compatible for PC.SSD connects through U.3 PCIe 4.0 (NVMe).Dimensions: 0.6"H.3-year manufacturer limited warranty

LEGEND 850 LITE supports the latest PCIe Gen4 x4 interface, which meets the NVMe 1.4 standard. It offers excellent read and write performance, expanded device connectivity, and support for the latest Intel and AMD platforms. Whether on a desktop or notebook PC, progress you creativity. LEGEND 850 LITE delivers sequential read and write speed of 5,000/4,200MB per second, which is up to 3 times faster than a standard PCIe Gen3 SSD and 9 times faster than a SATA SSD. It is backward compatible with PCIe 3.0 and made for creating, whether 3D graphic of video!.Internal PCIe Gen4 x4 SSD for consumer and business use, optimized for fast gaming, creative tasks, and system upgrades.With the stunning reading speed of 5000 MB/s, get faster boot times and improved overall computing performance.Write speed of 3200 MB/s enables you to perform write-related tasks in seconds rather than minutes.Provides sufficient storage capacity of 1000 GB for your computer.Uses 3D NAND flash for higher capacity, speed, and reliability than planar NAND.Features LDPC (Low-Density Parity-Check) ECC technology for reliable error correction.M.2 2280 form factor for added reliability and dependability.Compatible with both PC and Mac platforms, and also supports PlayStation 5 for gaming applications.256-bit AES encryption for enhanced data security and management.Offers solid durability with shock resistance rated at 1500G/0.5ms and an operating temperature range of 0°C to 70°C.Powered via M.2 PCIe Gen4 x4 with HMB and SLC caching for efficient performance and power use.3-year limited warranty, covering both parts and labor

PCIe M.2 SSDs PCIe SSD 115S Upgrade your computer performance to a whole new level with Transcend's PCIe SSD 115S! Boasting the slick PCIe Gen 3x4 interface and slim M.2 2280 size, the PCIe SSD 115S is the perfect speedy and sizable companion for your desktops, laptops, and ultrabooks Astounding Performance Transcend's PCIe SSD 115S follows NVMe 1.4 specifications and comes with the PCIe™ Gen3 x4 interface, meaning four lanes are used for transmitting and receiving data simultaneously, resulting in excellent performance of read speeds up to 3,200MB/s and write speeds up to 2,000MB/s. Note: Performance is based on CrystalDiskMark v5.0.2. Low Power Consumption The PCIe SSD 115S comes in the M.2 2280 form factor, perfect for desktops, laptops, and ultrabooks! The low-power design makes PCIe performance possible with the best power efficiency. Ample Storage Capacity Transcend's PCIe SSD 115S is available in capacities of up to 2TB, giving users plenty of space to store multiple files. Always Reliable, Always Evolving. Transcend's PCIe SSD 115S is engineered with LDPC (Low-Density Parity Check) coding, a powerful ECC algorithm, to keep data secure. Designed with the dynamic thermal throttling mechanism, it guarantees superior endurance and stability for high-end applications. Transcend SSD Scope Software Transcend's SSD Scope is an advanced, user-friendly software that makes it easy to monitor the condition and optimize the performance of your Transcend SSD, ensuring that it remains healthy and continues to run fast and error-free. Guaranteed Quality To ensure the utmost level of quality, Transcend SSDs undergo rigorous testing at all stages of production, including tests for temperature, speed, and functionality..Internal drive type for maximum efficiency and dependability.Store as many documents, pictures and videos as you need with 1 TB capacity.The high-read speed of 3200 MB/s maximizes system performance and saves time while you are doing complex tasks.Write speed of 2000 MB/s enables you to perform write-related tasks in seconds rather than minutes

The SanDisk Extreme® Portable SSD keeps up with your active lifestyle, thanks to speeds up to 1050MB/s read and a massive storage capacity at up to 8TB. No matter where you explore, this drive is tough enough to handle it. It's drop-proof up to 3 meters, and IP65 water and dust resistant. Plus, a handy carabiner loop lets you clip it securely to your bag. Trusted by professional photographers, the SanDisk Extreme® Portable SSD is the perfect blend of speed, durability, and peace of mind. Backed by a 5-year limited warranty, you can capture and store your favorite memories with confidence..Powerful yet portable Get fast NVMe™ solid state performance with up to 1050MB/s read and 1000MB/s write speeds in a portable, high-capacity drive, up to 8TB that’s perfect for creating amazing content or capturing incredible footage..Tough enough to take with you Up to three-meter drop protection and IP65 water and dust resistance mean this durable drive can take a beating..Travel worry-free Get extra peace of mind with a 5-year limited warranty and a durable silicone shell that offers a premium feel and added protection to the drive’s exterior..It goes where you go Use the handy carabiner loop to attach the drive to your belt loop or backpack for extra security when you’re out in the world..Put a lock on your files Help keep private content private with the included password protection featuring 256‐bit AES hardware encryption..Chase your inspiration with no hesitation.

HPE NVMe PCIe Gen4 U.3 SSDs deliver higher performance for server-storage solutions to better meet the challenges within high performance workloads..Hot-swap solid-state drive features PCI Express interface.SSD provides 7100MBps read speed and 4200MBps write speed.Memory capacity: 3.2TB.Form factor: 2.5" SFF.Compatible for PC.SSD connects through U.3 PCIe 4.0 (NVMe).Dimensions: 0.6"H.3-year manufacturer limited warranty

LaCie Rugged SSD offers filmmakers and DITs a substantial boost thanks to Seagate FireCuda NVMe speeds of up to 950MB/s with encryption plus dust, water, and drop resistance in a palm-sized solution. Enjoy spacious capacity and seamless compatibility with Thunderbolt 3, USB-C, and USB 3.0 on both Mac and Windows computers..SSD provides 950MBps data transfer rate.Memory capacity: 500GB.Dimensions: 0.67"H x 2.56"W x 3.85"D.Keep personal files and confidential data restricted from hackers and thieves.SSD is water-resistant.Powered by USB connection.Meets or exceeds IP67 standard.5-year manufacturer limited warranty.Sprint through projects with a 500GB portable SSD Drive that harnesses Seagate FireCuda NV Me speeds of up to 950MB/s for 4K footage

The SanDisk Extreme® Portable SSD keeps up with your active lifestyle, thanks to speeds up to 1050MB/s read and a massive storage capacity at up to 8TB. No matter where you explore, this drive is tough enough to handle it. It's drop-proof up to 3 meters, and IP65 water and dust resistant. Plus, a handy carabiner loop lets you clip it securely to your bag. Trusted by professional photographers, the SanDisk Extreme® Portable SSD is the perfect blend of speed, durability, and peace of mind. Backed by a 5-year limited warranty, you can capture and store your favorite memories with confidence..Powerful yet portable Get fast NVMe™ solid state performance with up to 1050MB/s read and 1000MB/s write speeds in a portable, high-capacity drive, up to 8TB that’s perfect for creating amazing content or capturing incredible footage..Tough enough to take with you Up to three-meter drop protection and IP65 water and dust resistance† mean this durable drive can take a beating..Travel worry-free Get extra peace of mind with a 5-year limited warranty and a durable silicone shell that offers a premium feel and added protection to the drive’s exterior..It goes where you go Use the handy carabiner loop to attach the drive to your belt loop or backpack for extra security when you’re out in the world..Put a lock on your files Help keep private content private with the included password protection featuring 256‐bit AES hardware encryption..Chase your inspiration with no hesitation.

Optimized PCIe 4.0 NVMe performance for servers | DC2000B PCIe 4.0 NVMe M.2 SSDEnterprise Class for Server Applications Kingston DC2000B is a high-performance PCIe 4.0 NVMe M.2 SSD using the latest Gen 4x4 PCIe interface with 112-layer 3D TLC NAND. Ideally suited for use in high-volume rack-mount servers as an internal boot drive(s) to preserve valuable front-loading drive bays, as well as for use in purpose-built systems where a high-performance M.2 SSD is needed that includes hardware-based on-board power loss protection (PLP). New for DC2000B is an integrated aluminum heatsink that offers broader thermal compatibility for a wide range of systems. DC2000B delivers low latency and excellent IO consistency to handle various workloads from boot drive applications to high-speed application caching. DC2000B is rated at 0.4 DWPD write endurance and carries a 5-year warranty. PCIe 4.0 NVMe Gen 4x4 performance Hardware-based power loss protection Ask a Server SSD Expert Planning the right solution requires an understanding of your project's security goals. Let Kingston's experts guide you. Key Features | PCIe 4.0 NVMe Performance Utilizes PCIe Gen 4x4 lanes for high-performance speeds. On-board Power Loss Protection (PLP) Reduce the possibility of data loss and/or corruption due to unexpected power-off..Internal drive type for a reliable and convenient storage solution.With a capacity of 480 GB, you have large storage space for all your documents and data.PCI Express NVMe 4.0 x4 interface for a speedy data transfer to ensure maximum efficiency.M.2 2280 form factor for your convenience and simplicity of usage

The WD_BLACK 2TB C50 Expansion Card is a high-performance storage solution designed specifically for Xbox Series X|S consoles. With a substantial 2TB capacity, it provides ample space for your growing game library. This NVMe SSD expansion card seamlessly integrates with the Xbox Velocity Architecture, ensuring fast load times and smooth gameplay. It supports Quick Resume, allowing you to switch between multiple games effortlessly. The compact and durable design fits perfectly into the Xbox Expansion Slot, making installation a breeze. Additionally, it comes with a 5-year warranty, offering peace of mind for long-term use. Whether you're a casual gamer or a hardcore enthusiast, the WD_BLACK C50 Expansion Card enhances your gaming experience by delivering reliable and speedy storage..This is an NVMe SSD designed for use with Xbox Series X|S consoles, utilizing the Xbox Expansion Slot for seamless integration..It offers high-speed performance with read and write speeds that match the internal storage of the Xbox Series X|S, ensuring quick load times and smooth gameplay..The expansion card has a 2TB capacity, providing ample space for a large game library. It uses advanced NAND technology for reliable storage..The SSD is equipped with a high-performance controller and error-correcting code (ECC) memory to ensure data integrity and reliability..The compact form factor fits perfectly into the Xbox Expansion Slot, making it easy to install and use..Specifically designed for Xbox Series X|S, ensuring full compatibility and optimal performance with these consoles..The SSD includes built-in security features to protect your data and ensure safe storage..It is designed to operate within safe temperature ranges and includes protections against overheating and other potential hazards..The expansion card draws power directly from the Xbox console, with efficient power management to minimize energy consumption..It connects via the Xbox Expansion Slot and is designed to support a single Xbox Series X|S console..There are no additional ports or slots on the expansion card, as it is designed to fit directly into the Xbox Expansion Slot..The WD_BLACK C50 Expansion Card comes with a 5-year warranty, covering both parts and labor, providing peace of mind for long-term use.

The SanDisk Extreme® Portable SSD keeps up with your active lifestyle, thanks to speeds up to 1050MB/s read and a massive storage capacity at up to 8TB. No matter where you explore, this drive is tough enough to handle it. It's drop-proof up to 3 meters, and IP65 water and dust resistant. Plus, a handy carabiner loop lets you clip it securely to your bag. Trusted by professional photographers, the SanDisk Extreme® Portable SSD is the perfect blend of speed, durability, and peace of mind. Backed by a 5-year limited warranty, you can capture and store your favorite memories with confidence..Powerful yet portable Get fast NVMe™ solid state performance with up to 1050MB/s read and 1000MB/s write speeds in a portable, high-capacity drive, up to 8TB that’s perfect for creating amazing content or capturing incredible footage..Tough enough to take with you Up to three-meter drop protection and IP65 water and dust resistance mean this durable drive can take a beating..Travel worry-free Get extra peace of mind with a 5-year limited warranty and a durable silicone shell that offers a premium feel and added protection to the drive’s exterior..It goes where you go Use the handy carabiner loop to attach the drive to your belt loop or backpack for extra security when you’re out in the world..Put a lock on your files Help keep private content private with the included password protection featuring 256‐bit AES hardware encryption..Chase your inspiration with no hesitation.

Optimized PCIe 4.0 NVMe performance for servers | DC2000B PCIe 4.0 NVMe M.2 SSDEnterprise Class for Server Applications Kingston DC2000B is a high-performance PCIe 4.0 NVMe M.2 SSD using the latest Gen 4x4 PCIe interface with 112-layer 3D TLC NAND. Ideally suited for use in high-volume rack-mount servers as an internal boot drive(s) to preserve valuable front-loading drive bays, as well as for use in purpose-built systems where a high-performance M.2 SSD is needed that includes hardware-based on-board power loss protection (PLP). New for DC2000B is an integrated aluminum heatsink that offers broader thermal compatibility for a wide range of systems. DC2000B delivers low latency and excellent IO consistency to handle various workloads from boot drive applications to high-speed application caching. DC2000B is rated at 0.4 DWPD write endurance and carries a 5-year warranty. PCIe 4.0 NVMe Gen 4x4 performance Hardware-based power loss protection Ask a Server SSD Expert Planning the right solution requires an understanding of your project's security goals. Let Kingston's experts guide you. Key Features | PCIe 4.0 NVMe Performance Utilizes PCIe Gen 4x4 lanes for high-performance speeds. On-board Power Loss Protection (PLP) Reduce the possibility of data loss and/or corruption due to unexpected power-off..Internal drive type for maximum efficiency and dependability.Provides sufficient storage capacity of 960 GB for your computer.PCI Express NVMe 4.0 x4 interface for a speedy data transfer to ensure maximum efficiency.M.2 2280 form factor allows hassle-free and easy usage with increased efficiency

LaCie Rugged SSD is the perfect NVMe-boosted solution for filmmakers and DITs. Get speeds of up to 950MB/s, extreme IP67-rated water resistance, three-meter drop resistance, and password protection in a palm-sized USB-C drive..Small and thin USB Type C interface works with the thinnest devices.With 4 TB capacity you have ample space for storing millions of images, hundreds of hours of video or for music lovers, up to a million songs.Solid State Drive is reliable and offers convenient storage solution.Is portable, can be carried anywhere to ensure maximum efficiency.2.5" form factor for your convenience and simplicity of usage

Performance that takes your productivity further. Save, access, and protect the content that matters to you with the WD My Passport solid-state drive giving you read speeds of up to 1050MB/s and write speeds of up to 1000MB/s with NVMe technology. Help secure your drive, and keep productivity flowing with password-enabled 256-bit AES hardware encryption. Find peace of mind with My Passport that is able to simply back up your data, compatible with macOS and Windows, and ready to use right out of the box..Portable external solid-state drive with USB 3.2 interface for macOS and Windows.Delivers read speeds of up to 1050MB/s and write speeds of up to 1000MB/s with a NVMe technology.Provides high speed and durability with a 1TB capacity.Dimensions: 3.94"H x 2.17"W x 0.35"D.Keeps personal files and confidential data restricted from hackers and thieves with 256-bit AES encryption.Resists drops of up to 6.5' with a sleek, durable metal design that is both shock- and vibration-proof.Powered by USB connection.Ready to use right out of the box.Meets or exceeds the RoHS standard.5-year manufacturer limited warranty