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Western Digital Redefines DRAM Caching

In a recent announcement, Western Digital (or at least the HGST part of the company) announced the release of an interesting if not curious solution for extending DRAM with fast storage.  The Ultrastar DC ME200 extends server DRAM using proprietary caching software in an attempt to fully exploit the capabilities of modern multi-core processors.  In… Read more »

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HDD Capacity Threshold Reaches 15TB

Western Digital has announced what is currently the largest capacity hard drive available on the market today.  The Ultrastar DC HC620 has 15TB of capacity in a helium-filled 3.5″ form-factor.  This is a 7% increase (or obviously 1TB) over the 14TB drive announced in October 2017. Incremental The new capacity drive looks more like an… Read more »

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Samsung Introduces 8TB NF1 NVMe SSDs

Samsung has recently announced an 8TB NF1 format NVMe SSD.  NF1 was originally called NGSFF (Next Generation Small Form Factor) and is intended as a replacement for the existing M.2 format drives.  With 15K and 10K drives disappearing from the market, is it time to accept we should move on from legacy HDD drive sizes?… Read more »

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What are TBW (Terabytes Written) and DWPD (Device Writes Per Day)?

TBW is an acronym for  Terabytes Written and DWPD is an acronym for Device Writes Per Day.  Both are measures of the endurance of flash storage. Conflating Reliability and Endurance in SSDs What is the Technology Behind Samsung Z-NAND? Flash storage has a limit on the number of write (or specifically program/erase) cycles that can… Read more »

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Dude, Here’s Your 100TB Flash Drive!

It’s been only a month since I wrote about Samsung’s 30TB solid state disk and already the bar has been set higher.  This week Nimbus Data announced a 100TB 3.5″ SSD (the DC100) that blows past the proof of concept 60TB drive demonstrated by Seagate only a few years ago.  How real is 100TB in… Read more »

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Backblaze HDD Statistics for 2017

For the last four years, Backblaze has been producing statistics from their pool of hard drives.  The company provides cloud storage that started with backup and now covers S3-like capabilities.  The figures for 2017 were recently released and make interesting reading. SMART Backblaze now has a set of data spanning just over 93,000 live drives. … Read more »

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Making The Case for SATA SSDs

Update:  Looks like Samsung released new versions of their 800 Series, also focused on increased endurance (link) although products are a mix of MLC and TLC. Micron has recently announced a refresh to their 5100 SATA SSD series with the release of the 5200 series using 64-layer 3D-NAND technology.  As discussed on our most recent… Read more »

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Has NVMe Killed off NVDIMM?

Update: I’ve added extra links at the end of this post, covering some background reading/watching from SNIA. According to a recent article on The Register, Diablo Technologies appears to have closed down.  Diablo was or is a manufacturer of NVDIMM and DRAM extension technology, including Memory1.  As previously reported, many of the original founders and… Read more »

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When Did Hard Drives Get Workload Rate Limits?

A recent article on The Register reminded me that we’ve started to see hard drive vendors introducing warranty limits on their hard drives for the amount of data that can be written to them in any one year.  Solid state drives have always had this restriction, because we know that flash is damaged by being… Read more »