![]() This assumes that the host port / drivers on the PC support UASP. If the numbers for the two access traces are in the same ballpark, NCQ / UASP is not supported. Comparing the '4K Q32T16' and '4K Q1T1' numbers can quickly tell us whether the storage device supports NCQ (native command queuing) / UASP (USB-attached SCSI protocol). The plain 'Rnd4K' one uses only a single queue and single thread. The 'Seq1M' traces use a 1MiB block size. The 'Seq128K Q32T1' sequential traces use 128K block size with a queue depth of 32 from a single thread, while the '4K Q32T16' one does random 4K accesses with the same queue configuration, but from multiple threads. Internally, CrystalDiskMark uses the Microsoft DiskSpd storage testing tool. Two of the traces are sequential accesses, while two are 4K random accesses. ![]() for example, uses four different access traces for reads and writes over a configurable region size. The effect of enabling write caching are also evident at higher I/O sizes, with the feature enabling better consistency.ĬrystalDiskMark. It does allow the visualization of change in transfer rates as the I/O size changes, with optimal performance being reached around 1 MB for a queue depth of 4. ATTO benchmarking is restricted to a single configuration in terms of queue depth, and is only representative of a small sub-set of real-world workloads. In fact, WD has been quite conservative in their claims, and has actually put in numbers that are more representative of sustained usage for the PRO-G40's use-case. Western Digital claims read and write speeds of 2700 MBps and 1900 MBps respectively, and these are backed up by the ATTO benchmarks provided below. Yet another use of these synthetic benchmarks is the ability to gather information regarding support for specific storage device features that affect performance. The results translate to the instantaneous performance numbers that consumers can expect for specific workloads, but do not account for changes in behavior when the unit is subject to long-term conditioning and/or thermal throttling. Best of all by installing this drive in a midrange PC system, the user should notice some impressive speeds from boot-up, general Windows use and even gaming which is where the SanDisk Ultra II SSD shines.Synthetic Benchmarks - ATTO and CrystalDiskMarkīenchmarks such as ATTO and CrystalDiskMark help provide a quick look at the performance of the direct-attached storage device. The SanDisk Ultra II SSD is a very impressive drive that for the 240GB is priced at just $125.00 AUD (November 2014) and definitely gives it competitors (did someone say Samsung) a run for their money in terms of performance and price. The drive scored a respectable (and fast) 3 seconds to logon and 17.41 seconds to the desktop. As you can see from the results below, the unit did mirror the documentation from SanDisk in terms of its performance.Īnother tool we tried was BootRacer which is a free utility that measures how long it takes your PC to boot up and saves it in an archive in order to fine-tune your operating system. However in order to see how the drive performs is via benchmarking and we tested this unit on several programs that included ATTO Disk Benchmark, Crystal Disk Mark and AS SSD, three very popular software testing programs. This utility is very informative and more importantly easy to use which includes access to the excellent SanDisk Support System. The dashboard is broken down into Status, Performance, Tools, Settings and Help. ![]() features, allows for firmware upgrades and silently monitors your drive. The drive also supports the SanDisk SSD Dashboard which monitors the drive, includes the S.M.A.R.T. Power consumption is equally impressive that during maximum read speeds is 2.7W with write speeds of 4.5W and an idle rate of just 75mW. The drive is also a ultra-slim 2.5 inch 7mm form factor unit that improves multitasking thanks to its volatile and non-volatile tiered caching. This is not to say that the drive will fail after the 3-year warranty but it’s an additional layer of protection for the user, especially of the integrity of data. that stands for Self-monitoring, Analysis and Reporting Technology which basically monitors your drive for any issues that may be linked to drive failure. The drive also comes with the inclusion of S.M.A.R.T. The drive also comes with a 3-year warranty from SanDisk and uses TLC Flash NAND to not only drop the production cost but when added with the Marvell 88SS9187 controller and the nCache 2.0, it creates a rather impressive drive that boasts sequential read speeds of up to 550MB/s and sequential write speeds of up to 500MB/s. The SanDisk Ultra II SSD comes in a variety of sizes that include 120GB, 240GB (reviewed), 480GB and 960GB which although isn’t the fast drive on the market, is relatively quite well priced compared to its competitors. ![]()
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