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New Post has been published on http://www.thessdreview.com/featured/jmicron-displays-worlds-first-usb-to-pcie-nvme-bridge-chip-capable-of-1gb-s-computex-2018-taipei-update/

JMicron Displays Worlds First USB to PCIe/NVMe Bridge Chip Capable of 1GB/s - Computex 2018 Taipei Update

En el foro de armbian hay mucha información interesante, allí descubrí la existencia del protocolo UAS o UASP.

USB Attached SCSI (UAS) o USB Attached SCSI Protocol (UASP) es un protocolo de informático utilizado para mover datos desde y hacia dispositivos de almacenamiento USB como discos duros (HDD), unidades de estado sólido (SSD) y unidades de memoria USB. UAS depende del protocolo USB y utiliza el conjunto de comandos SCSI estándar. El uso de UAS por lo general proporciona transferencias más rápidas en comparación con los controladores estándar USB (BOT, Bulk-Only Transport) de almacenamiento masivo .

Se trata de una mejora del USB que permite manejar los datos de forma paralela, de forma que se obtienen mejores resultados cuando se copian varios archivos a la vez. La mejora en teoría se produce en puertos USB3.0 pero también en USB2.0.

Para las pruebas voy a utilizar la herramienta Discos que está disponible para Ubuntu y Debian, en realidad el nombre exacto es gnome-disk-utility

Los chipsets recomendados para Linux son los que aparecen en la web de Sunxi linux:

ASMedia ASM1053-s y ASMedia ASM1153

Genesys Logic GL3310

JMicron JMS56, JMicron JMS567, JMicron JMS568 y JMicron JMS578

VIA VL711, VIA VL715 y VL716

En especial los de la marca JMicron como los que podéis encontrar en las cajas USB de SALCAR

HDD UASP vs USB

Sin UASP

Con UASP

Con el disco duro mecánico, HDD, ganamos algo de velocidad media de lectura pasando de 42,6MB/s a 49,1MB/s. En escritura pasa algo raro y la media se derrumba pasando de 42,0MB/s a 30,5MB/s. La velocidad punta del UASP llega a 63MB/s en lectura frente a los 45MB/s sin esa opción. En punta de escritura se vuelve a perder velocidad ¿ni idea de por qué?.

El tiempo de acceso no varia, es de 17,40 mseg en ambos casos.

SSD UASP vs USB

sin UASP

con UASP

Ahora vamos con el disco duro en estado sólido, SSD. Aquí la ganancia es bestial. Pasamos de 39,9MB/s a 156,7MB/s en lectura casi multiplica por 4. Y en escritura de 44,7MB/s a 87,7MB/s aquí es más del doble. En cuanto a la velocidad punta se llega a 450MB/s en lectura y a 90MB/s en escritura. Lo cual es más de 10 veces y más del doble respectivamente.

El tiempo de acceso varia muy poco, pasa de 0,81 mseg a 0,83 mseg.

UASP con USB2.0

HDD UASP USB2.0

SSD UASP USB2.0

Aquí lo que comprobamos es que la supuesta ventaja que también se consigue usando un USB2.0 no es tal, al menos en mi caso.

CONCLUSIÓN: Si vas a usar un disco externo SSD con un puerto USB3.0 merece mucho la pena esta tecnología, así que revisad bien el chipset que incluye para que sea UASP. En mis pruebas he usado una carcasa o caja de la marca SALCAR con el chipset JMS578 de la marca JMicron.

New Post has been published on http://www.thessdreview.com/flash-memory-summit-2016/maxiotek-shows-off-latest-dram-less-controllers/

Maxiotek Shows Off Latest DRAM-less Controllers – Flash Memory Summit 2016 Update

In terms of specs, the ADATA SX930 combines a JMicron JMF670H controller with synchronous MLC “plus” NAND to deliver 540MB/s read and 420MB/s write speeds. While this is not the current best-of-the-best stats-wise, ADATA aims to appeal to the practical sensibilities of gamers by offering a long 5-year warranty and a recent price drop that makes the SX930 series much more competitive than it initially was when introduced several months ago.

[sc:sponsor sponsor=”ADATA” product_link=”http://www.adata.com/en/ssd/feature/328″ product_name=”SX930 240GB SSD” product_price_link=”http://amzn.to/1S0hsvG” product_price=”$79.99″ ]

The label on the disk itself is visible through the front window of the packaging and the wider box suggests that a 3.5″ adapter is included as well as having sufficient protective padding. The back of the XPG SX930 includes a QR code that when scanned leads users to the software download page which includes Acronis True Image HD disk migration utility, ADATA’s SSD Toolbox and more.

  The accessories include a 2.5mm thick riser which is typical of 7mm thick SSDs these days although unlike most, this one is quite a bit wider covering the entirety of the non-label area of the bottom. A 2.5″ to 3.5″ adapter is included as well with mounting screws and a quick start guide.

Specifications:

Capacity 120GB / 240GB / 480GB Form Factor 2.5″ NAND Flash Synchronous MLC Plus Controller JMicron JMF670H Dimensions (L x W x H) 100.45 x 69.85 x 7mm Weight 68g / 2.4oz Interface SATA 6Gb/s Performance(Max) 120GB Performance (ATTO) Read: Up to 560MB/s Write: Up to 460MB/s 240GB Performance (ATTO) Read: Up to 560MB/s Write: Up to 460MB/s 480GB Performance (ATTO) Read: Up to 540MB/s Write: Up to 420MB/s*Performance may vary based on SSD capacity, hardware test platform, test software, operating system and other system variables.  Operating temperature 0~70°C Storage temperature -40~85°C Shock resistance 1500G/0.5ms MTBF 1,500,000 hours Warranty 5 years

No hummingbirds present here either, although the dark anodized brushed aluminum enclosure certainly fits well with the flame-on-black label of the XPG SX930 series SSDs. At the back, a white label for contrast has the model number, warranty, code and wwn code. Apparently, removing this back label will also void the warranty.

Inside, the actual PCB only fills half of the enclosure. This is typical of SSDs used in embedded systems where the smaller form factor is more functional. There is a noticeable lack of any cooling pads on the PCB. To open the SX930, the screws are accessed on the sides and another warranty void sticker is present covering the top right screw.

A JMicron JMF670H 4-channel controller with a NANYA 800MHz DDR3 CL11 is found at the heart of it. The JMicron JMF670H was initially introduced to compete with the likes of Silicon Motion’s 2256 and Phison’s S8 controllers as the bulk of SSD sales are in the value and mainstream segment. ADATA bins the NAND chip for the SX930, hence the 5-year warranty confidence. Like their SP550 and SP560 SSDs, Micron provides the NAND but unlike those previous models which use 16nm Micron TLC, the SX930 uses 16nm MLC.

[section_title title=Test System and Benchmarks]

Test System and Benchmark Results for the ADATA SX930 240GB SSD

Test SSD was connected via Intel SATA with Intel RST iaStorA 14.8.0.1042 drivers installed. C-states and EIST disabled for the Intel Core i7-6700K CPU and Windows power saving set to high-performance. The system is left to idle for a period of time after each run. Benchmarks are provided “as-is” in screenshot form for full transparency. As with the rest of our reviews, performance behaviour is the goal instead of simply direct comparisons. All the benchmarks here are easily reproducible and requires no special hardware that cannot be purchased by the public.

To simulate typical consumer drive performance, the operating system was loaded on the test drive and is written at least 5x its total size and settled to 75% capacity which will be compared with the fresh out of box/secure erased performance. All tests were performed at least three times for accuracy.

Processor Intel Core i7-6700K (ES) Motherboard EVGA Z170 FTW (1.08 BIOS) CPU Cooler Noctua NH-D15S Graphics 2x8GB HyperX Savage 2666MHz DDR4 Video Card Gigabyte GTX 960 2GB Drive OCZ Vertex 4 (OS-Fresh out of box)

ADATA SX930 240GB 5.9E BIOS (OS-75%)

Case DimasTech Mini v1 Power Supply Corsair HX850W Operating System Windows 10 Pro

ADATA has an SSD Toolbox software free for download for monitoring, updating firmware and secure erasing an ADATA SSD. The drive info page shows a graphical overview of the drive health including temperature, bytes written and estimated life remaining.

While the SSD Toolbox and its utilities are compatible with Windows 10, secure erase can only be performed on a Windows 7 system. The toolbox version and firmware can be updated here as well as OS optimizations for those running a non-Windows 10 OS.

Crystal Disk Mark benchmarks read and write tests for sequential, 512K, 4K and queue depth 32 4K. Both random (default) and 0-fill sets were performed to show compressible and incompressible performance:

AIDA64 (formerly Everest) has a disk benchmark suite that measures read performance (in MB/s) and shows average read access. The test is set to 1MB block size.

ATTO disk benchmark is a 32-bit compressible data benchmark that measures read and write speeds across various file transfer sizes from 0.5KB to 8192KB to show SSD behaviour.

Unlike ATTO, AS SSD uses incompressible data for benchmarking and can measure read/write performance in MB/s or in iops. AS SSD also has a Copy Benchmark which simulates ISO, Game and program performance, providing both speed and access time results.

Anvil Storage Utilities is a comprehensive storage testing program that provides plenty of information and option for each test. For this review, 100% incompressible, 46% incompressible (simulating Applications) and 0-fill compression data were used to observe behaviour across.

PCMark 8 from Futuremark is a semi-synthetic testing suite that has a specialized Storage testing performance feature. It simulates storage performance while playing games, running productivity and creative programs and generates a total score based on how long each test took and the storage device behaviour during its 3-set run.

[section_title title=Final Thoughts about the ADATA SX930]

Final Thoughts

The ADATA SX930 sits in a good position right now with the 480GB model available on Amazon for $149 and the 240GB model reviewed is only at $79. Unlike many budget oriented SSDs, the ADATA SX930 managed to retain respectable performance even when filled. This is performance that is very good even closely comparable to more expensive SATA models, but that is because the XPG SX930 was introduced as a mainstream segment drive for gamers but is now enjoying a very competitive product pricing because SSD’s in general are continually becoming affordable and the gap between budget and mainstream, decreasing. This gap is often within $20 so naturally, the originally mainstream positioned products are favored. It is not within the absolute top-end SATA performance, but considering the price, it is worthy competition.

The ADATA XPG SX930 also manages to offer a leg up on its closest competitors in terms of added value with a 5-year warranty and a full-kit including migration and management software.  This is an extra peace of mind that many users will be glad to have considering the market is very competitive with plenty of options to choose from. At $79.99 on Amazon currently, the XPG SX930 has considerable lead over something like the Crucial BX100 250GB (currently at $109.99 on Amazon), which used to offer superior value and performance before the XPG SX930 240GB’s price drop appealing to the budget oriented and practical minded.

[sc:must_have_award ]

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