Hard drive for macbook air 2015
This is mostly due to a streamlined storage stack and the fact that NVMe requires no register reads to issue a command. The biggest advantage of NVMe is its lower latency. we'll likely see RRAM and MRAM enter the storage market before 2020).
Hard drive for macbook air 2015 software#
NVMe in turn is built specifically for SSDs and PCIe, and as software interfaces usually live for at least a decade before being replaced, NVMe was designed to be capable of meeting the industry needs as we move to future memory technologies (i.e.
Hard drive for macbook air 2015 full#
As a result AHCI can't take full advantage of SSDs, particularly PCIe SSDs with their high bandwidth links, leading the storage industry to develop a software interface that abolishes the limits of AHCI. While that doesn't prevent its use on SSDs, AHCI is more optimized for high latency rotating media than low latency non-volatile storage. NVMe replaces AHCI (Advanced Host Controller Interface), which dates back to 2004 and was designed with hard drives in mind.
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Short for Non-Volatile Memory Express, NVMe is a new software interface/protocol designed specifically for PCIe SSDs, and designed to complete what has been a two-part transition from SATA SSDs to PCIe SSDs. Clearly the MacBook’s SSD was going to be a much bigger deal than I first thought. Second of all the device listed under NVMExpress has a model number prefix we’ve never seen before not Samsung or Toshiba, but rather an Apple-ish “AP”. First and foremost, a new section was available under the Hardware tree called NVMExpress. So imagine my surprise when I opened up the System Profiler to see under the hood, and found not one but two unexpected things. Consequently what I was expecting was a Samsung or Toshiba PCIe SSD soldered on to the logic board, similar to the SSD selection of Apple’s other devices. Which makes a lot of sense, as Apple choosing to save every last millimeter means a M.2 SSD would be out of the question, and meanwhile Apple has plenty of SSD suppliers to choose from, even for soldered designs.
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While we haven’t seen both sides of the MacBook’s logic board, and as a result can’t say with certainty how it’s laid out, from the side we have seen it's clear that we’re also looking at a soldered SSD. To be honest, prior to receiving the MacBook I wasn’t expecting anything particularly interesting for the laptop’s SSD. The MacBook’s SSD: NVMe & an Apple Developed SSD Controller?