Lenovo Thinkpad Serial Ata Hard Drive Bay Adapter T60
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M.2 is a solid-state drive (SSD) form factor primarily used as an operating system boot solution. Lenovo ThinkSystem servers support M.2 drives either with the addition of a supported M.2 adapter or module, or directly on the system board.
- Integrated on the system board
- M.2 adapter with back-to-back drives
- M.2 adapter with side-by-side drives
- M.2 adapter in a PCIe slot
- SE350 data drive implementation
On servers with 1st-Gen and 2nd-Gen Intel Xeon Scalable Processors, and on the SE350, the M.2 drives install into an M.2 adapter which in turn is installed in a dedicated slot in the server. With two M.2 drives configured, the drives are configured by default as a RAID-1 mirrored pair for redundancy. There are two M.2 adapters supported:
Performance data of NVMe drives: The performance numbers for NVMe drives listed in the table are based on a PCIe x4 connection to the processor, however, when installed in a Lenovo M.2 adapter, the NVMe drives only have a x2 or x1 connection. As a result, this performance data should only be used for comparative purposes.
USB (Universal Serial Bus) is the most common expansion port on modern laptops and dates back to 1996. It typically has a rectangular shape and connects to a vast universe of peripherals, such as keyboards, mice, printers, and external hard drives. USB ports come in a variety of types and each has its own distinctive functionalities and characteristics.
Micro-USB is generally used for legacy smartphones, low-power tablets such as Amazon Kindles, some external hard drives, and random electronic devices. They most often support USB 2.0 speeds of up to 480 Mbps, but occasionally support USB 3.0, and micro-USB connections can be used interchangeably in both supported ports. USB Type-A and Type-C to micro-USB adapters are available if you wish to connect your supported device to a laptop without a micro-USB port.
When a computer dies due to a software failure rather than a hardware problem, its files remain inaccessible but intact on the hard drive. This wikiHow teaches you how to recover data from the hard drive of a laptop that has died. You can transfer it to a working computer or an an external hard drive.
A solid-state drive (SSD) is a solid-state storage device that uses integrated circuit assemblies to store data persistently, typically using flash memory, and functions as secondary storage in the hierarchy of computer storage.[1] It is also sometimes called a semiconductor storage device, a solid-state device, or a solid-state disk,[2] even though SSDs lack the physical spinning disks and movable read-write heads used in hard disk drives (HDDs) and floppy disks.[3] SSD also has rich internal parallelism for data processing.[4]
In comparison to hard disk drives and similar electromechanical media which use moving parts, SSDs are typically more resistant to physical shock, run silently, and have higher input/output rates and lower latency.[5] SSDs store data in semiconductor cells. As of 2019,[update] cells can contain between 1 and 4 bits of data. SSD storage devices vary in their properties according to the number of bits stored in each cell, with single-bit cells ("Single Level Cells" or "SLC") being generally the most reliable, durable, fast, and expensive type, compared with 2- and 3-bit cells ("Multi-Level Cells/MLC" and "Triple-Level Cells/TLC"), and finally, quad-bit cells ("QLC") being used for consumer devices that do not require such extreme properties and are the cheapest per gigabyte (GB) of the four. In addition, 3D XPoint memory (sold by Intel under the Optane brand) stores data by changing the electrical resistance of cells instead of storing electrical charges in cells, and SSDs made from RAM can be used for high speed, when data persistence after power loss is not required, or may use battery power to retain data when its usual power source is unavailable.[6] Hybrid drives or solid-state hybrid drives (SSHDs), such as Intel's Hystor[7] and Apple's Fusion Drive, combine features of SSDs and HDDs in the same unit using both flash memory and spinning magnetic disks in order to improve the performance of frequently-accessed data.[8][9][10] Bcache achieves a similar effect purely in software, using combinations of dedicated regular SSDs and HDDs.
The basis for flash-based SSDs, flash memory, was invented by Fujio Masuoka at Toshiba in 1980[38] and commercialized by Toshiba in 1987.[39][40] SanDisk Corporation (then SunDisk) founders Eli Harari and Sanjay Mehrotra, along with Robert D. Norman, saw the potential of flash memory as an alternative to existing hard drives, and filed a patent for a flash-based SSD in 1989.[41] The first commercial flash-based SSD was shipped by SanDisk in 1991.[38] It was a 20 MB SSD in a PCMCIA configuration, and sold OEM for around $1,000 and was used by IBM in a ThinkPad laptop.[42] In 1998, SanDisk introduced SSDs in 2.5-inch and 3.5-inch form factors with PATA interfaces.[43]
DRAM-based SSDs usually incorporate either an internal battery or an external AC/DC adapter and backup storage systems to ensure data persistence while no power is being supplied to the drive from external sources. If power is lost, the battery provides power while all information is copied from random access memory (RAM) to back-up storage. When the power is restored, the information is copied back to the RAM from the back-up storage, and the SSD resumes normal operation (similar to the hibernate function used in modern operating systems).[99][100]
A flash-based SSD typically uses a small amount of DRAM as a volatile cache, similar to the buffers in hard disk drives. A directory of block placement and wear leveling data is also kept in the cache while the drive is operating.[83] One SSD controller manufacturer, SandForce, does not use an external DRAM cache on their designs but still achieves high performance. Such an elimination of the external DRAM reduces the power consumption and enables further size reduction of SSDs.[118]
For general computer use, the 2.5-inch form factor (typically found in laptops) is the most popular. For desktop computers with 3.5-inch hard disk drive slots, a simple adapter plate can be used to make such a drive fit. Other types of form factors are more common in enterprise applications. An SSD can also be completely integrated in the other circuitry of the device, as in the Apple MacBook Air (starting with the fall 2010 model).[133] As of 2014[update], mSATA and M.2 form factors also gained popularity, primarily in laptops.
Some high performance, high capacity drives uses standard PCI Express add-in card form factor to house additional memory chips, permit the use of higher power levels, and allow the use of a large heat sink. There are also adapter boards that converts other form factors, especially M.2 drives with PCIe interface, into regular add-in cards.
A disk-on-a-module (DOM) is a flash drive with either 40/44-pin Parallel ATA (PATA) or SATA interface, intended to be plugged directly into the motherboard and used as a computer hard disk drive (HDD). DOM devices emulate a traditional hard disk drive, resulting in no need for special drivers or other specific operating system support. DOMs are usually used in embedded systems, which are often deployed in harsh environments where mechanical HDDs would simply fail, or in thin clients because of small size, low power consumption, and silent operation.
Most of the advantages of solid-state drives over traditional hard drives are due to their ability to access data completely electronically instead of electromechanically, resulting in superior transfer speeds and mechanical ruggedness.[148] On the other hand, hard disk drives offer significantly higher capacity for their price.[5][149]
SSDs were originally designed for use in a computer system. The first units were intended to replace or augment hard disk drives, so the operating system recognized them as a hard drive. Originally, solid state drives were even shaped and mounted in the computer like hard drives. Later SSDs became smaller and more compact, eventually developing their own unique form factors such as the M.2 form factor. The SSD was designed to be installed permanently inside a computer.[220]
SSDs have very different failure modes from traditional magnetic hard drives. Because solid-state drives contain no moving parts, they are generally not subject to mechanical failures. Instead, other kinds of failure are possible (for example, incomplete or failed writes due to sudden power failure can be more of a problem than with HDDs, and if a chip fails then all the data on it is lost, a scenario not applicable to magnetic drives). On the whole, however, studies have shown that SSDs are generally highly reliable, and often continue working far beyond the expected lifetime as stated by their manufacturer.[221]
A 2016 field study based on data collected over six years in Google's data centres and spanning "millions" of drive days found that the proportion of flash-based SSDs requiring replacement in their first four years of use ranged from 4% to 10% depending on the model. The authors concluded that SSDs fail at a significantly lower rate than hard disk drives.[221] (In contrast, a 2016 evaluation of 71,940 HDDs found failure rates comparable to those of Google's SSDs: the HDDs had on average an annualized failure rate of 1.95%.)[225] The study also showed, on the down-side, that SSDs experience significantly higher rates of uncorrectable errors (which cause data loss) than do HDDs. It also led to some unexpected results and implications:
Solid-state drives have set new challenges for data recovery companies, as the method of storing data is non-linear and much more complex than that of hard disk drives. The strategy by which the drive operates internally can vary largely between manufacturers, and the TRIM command zeroes the whole range of a deleted file. Wear leveling also means that the physical address of the data and the address exposed to the operating system are different.
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