questions about storage

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goofymcdooperface

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Feb 19, 2014
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So I was watching Linustechtips review of the Plextor M6e SSD and he said something's that interest me.
First of all he said that this drive uses AHDI commands instead of NVME commands and my question is what are AHDI and NVME . He also said that AHDI is better for compatibility reasons than NVME and my question is why?. Also when he was talking about the read/write speeds he mentioned something called a iops (I hope I spelled that correctly) and my question is what is an iops.
 
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Sakkura
It's AHCI - Advanced Host Controller Interface.

That's an older standard. It was mainly developed with traditional hard drives in mind, but it's also much better than the even older IDE standard when you're using an SSD.

NVMe is a new standard which is designed with SSDs in mind. It only works for drives connected via PCI Express or connections that involve PCI Express - SATA Express, for example. So it won't work with a regular (non-Express) SATA port.

IOPS means Input/Output Operations Per Second. It's a measure of speed mostly used for random read/writes, where the actual throughput in MB/s will be much, much lower - especially with traditional hard drives. Hard drives can transfer at reasonable MB/s but only as long as the files...
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Sakkura

Sakkura

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Aug 22, 2011
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It's AHCI - Advanced Host Controller Interface.

That's an older standard. It was mainly developed with traditional hard drives in mind, but it's also much better than the even older IDE standard when you're using an SSD.

NVMe is a new standard which is designed with SSDs in mind. It only works for drives connected via PCI Express or connections that involve PCI Express - SATA Express, for example. So it won't work with a regular (non-Express) SATA port.

IOPS means Input/Output Operations Per Second. It's a measure of speed mostly used for random read/writes, where the actual throughput in MB/s will be much, much lower - especially with traditional hard drives. Hard drives can transfer at reasonable MB/s but only as long as the files it reads/writes are in one long sequence. If they're scattered around then it slows down DRASTICALLY. SSDs don't suffer from that problem, though performance does still drop if you're writing/reading very small chunks of data.
 
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