- CMR recording method 7200 rpm SATA3 6Gb interface, 256M cache
- Helium sealed, transmission speed up to 248Mb, 250W no failure time
- Support 7 days * 24 hours * 365 uninterrupted work, power consumption 4.22W
- Support multi-bay raid array, which can withstand 550T data writing per year
"The following video is the actual performance of the hard disk directly connected to the motherboard and copied in the WIN7 system"
Media evaluation:
MG07ACA is Toshiba''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s seventh-generation 3.5-inch product for near-line applications in data centers, and it has launched 12TB and 14TB capacities. The 14TB version integrates 9 magnetic recording discs, making it the industry''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s first 3.5-inch version that integrates so many discs. Inch product. By filling helium gas, the "flying" state of the read-write head on the disc can be more stable, improving the accuracy of track positioning, and at the same time, it has less air resistance than normal, reducing operating power consumption.
In order to put 9 discs inside the 3.5-inch half-height size, Toshiba borrowed from its own 2.5-inch product line assembly experience to reduce the thickness of the disc and the distance between the discs. Therefore, the read-write drive arm and the printed circuit board components need to be redesigned. The same is true for the metal package shell, which is sealed with high-precision assembly and laser welding technology to prevent helium from overflowing and causing the product to fail to operate.
▲The complete model of the tested product is MG07ACA14TE, which is a 14TB version that integrates 9 discs and uses CMR recording.
▲The information sticker on the outside of the hard drive indicates that +12V and +5V require 0.75A and 0.7A. Compared with non-filled traditional hard drives, the power consumption is greatly reduced. The storage format is 512e.
▲The inside is filled with helium gas and welded by laser, and the side is still arranged with a complete screw key hole, which is compatible with most installation space designs.
The MG07ACA series is packaged with 9 discs. The thickness of each disc is reduced to 0.635mm. The previous generation uses a thickness of 0.8mm. At the same time, the distance between discs is reduced to achieve the goal of integrating 9 discs. At the same time, helium filling and high-precision assembly can also bring about the effect of reducing power consumption. Compared with the previous generation, power consumption per TB is reduced by 40%, which can save 1 transaction for high-density data centers. Not a small ongoing operating cost.
▲The transmission speed is compatible with SATA 6Gb/s, 3Gb/s, 1.5Gb/s. Although the interface adopts the SATA 3.3 specification, the PWDIS function is not arranged on the third pin, so it is compatible with previous power supplies or drawers.
▲Reverse mounting of the circuit board to avoid accidental damage to the exposed chip.
For ordinary consumers, MG07ACA is also sold on general 3C channels, which can enjoy the new generation of technology in a simple way, especially those players who need high-capacity hard drives but don''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''t want to worry about SMR. This series has 2.5 million hours of MTTF, read-write head loading and unloading times up to 600,000 times, unrecoverable read errors are enterprise-level specifications, standby noise is only 20dB, in addition to corporate near-line applications, home users can also be used as data storage Disks, high-performance NAS hard disks, etc.
▲Remove the circuit board, install thermal pads on the main control chip and motor control chip, use the metal shell to dissipate waste heat, and arrange sponge filling in the remaining space.
▲The circuit board uses a common L-shaped design.
▲Avaga DT02S2 control chip is packaged in bare die mode.
▲The cache memory is 256MB, using SK Hynix H5TQ2G63GFR, and supporting up to DDR3-1866.
▲The motor control chip is STMicroelectronics Smooth L7291.
▲The circuit board is equipped with vibration sensors in many places, and the sensing data is corrected by the control chip to prevent the vibration of high-density deployment from affecting the access performance.
▲MG07ACA enterprise-class capacity hard disk specifications, with 4Kn and 512e sector record format, and SIE（Sanitize Instant Erase）Features to choose from.
▲General operating temperature can reach 38℃（Room temperature 24℃, bare machine without additional fan）, In addition, it supports APM advanced power management.
Read and write beyond 270MB/s, write to the cache
CrystalDiskMark 6.0.0 has undergone major revisions, and the latest version has become more suitable for testing SSDs, but we still include it in the testing of traditional hard disks. Generally, we first check the capabilities of hard disks. MG07ACA14TE can read and write continuously up to about 270MB/s , While the manufacturer’s stated specification is about 248MiB/s, the measured speed is much higher.
▲The continuous reading and writing of CrystalDiskMark is about 270MB/s.
Then use ATTO Disk Benchmark to measure the transfer speed of this hard disk under different transfer block sizes. The first is the Overlapped I/O transfer mode, and manually adjust the queue depth to 8. The maximum read speed can be reached in about 4KB transfer block, and the write has to wait until about 8KB, the maximum of the two is about 280MB/ s and 276MB/s. Neither mode needs to be increased to a 64KB block size, with a maximum read and write performance of 279MB/s and 276MB/s.
▲ATTO Disk Benchmark Overlapped I/O queue depth 8, the maximum transmission speed can reach about 280MB/s
▲ATTO Disk Benchmark Neither mode, the maximum read and write speed is about 279MB/s and 276MB/s.
The veteran testing software HD Tune Pro has a variety of built-in testing methods, most of which are aimed at the characteristics of traditional hard drives, which can give a fairly complete performance evaluation. Hard disk full space read and write test, the outer circle can read and write up to 265.7MB/s and 260.1MB/s, the inner circle is 115.3MB/s and 114.7MB/s, the average value exceeds 200MB/s To 206.3MB/s and 204.4MB/s. The random write access time is affected by the cache mechanism. The average value is a very low 0.197ms, and the read performance is good at 12.4ms.
▲HD Tune Pro full-space reading test, the fastest outer ring is 265.7MB/s, and the random access time is 12.4 ms.
▲HD Tune Pro full-space write test, the fastest outer ring is 260.1MB/s, and random access due to the write cache, the delay time is quite excellent 0.197ms.
The random access time of different transmission block sizes, 512Byte, 4K, 64K read IOPS are all about 12.5ms/80IOPS, and random arbitrary size is 17ms/58IOPS. Cache acceleration can be enjoyed when the write transfer block is less than 64KB, the access time is less than 1ms, and the IOPS performance ranges from 1883IOPS to 4594IOPS. The 512e version tested this time adopts Persistent Write Cache technology, which uses the remaining rotational inertial electromotive force of the motor when the power is cut off accidentally to write the data still in the cache to the non-volatile memory.
▲Random read of different block sizes is about 12.5ms/80IOPS.
▲Thanks to the write cache mechanism, the average random write time of a transmission block below 64KB is less than 1ms.
If a fixed 4KB size is used, the read and write commands account for 70% and 30% respectively. The effect of the queue depth on the random access IOPS is measured, and the queue depth is 32（Maximum depth of AHCI specification）The performance is 202.994IOPS, and it decreases as the queue depth becomes shallower. The performance of the queue depth of 1 is 108.482IOPS.
▲When the queue depth of MG07ACA14TE is 32, the 4K random read and write performance with 70% and 30% read and write ratios is 202.994IOPS.
▲4K random read and write 70/30 actual IOPS data with various queue depths.
Large-capacity non-SMR hard drive
The SMR recording format can indeed increase the storage density. If it encounters a type of work with more frequent random writing, it will be limited by the SMR writing method and the performance will become unpredictable. Therefore, if a traditional hard disk encounters a workload that contains more random writes, it is better to choose a traditional CMR recording method hard disk.
Through helium filling and Toshiba''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''s own design and assembly experience, 9 discs are inserted into the 3.5-inch body to achieve a 14TB capacity, so that the CMR recording method can also catch up with the capacity density of SMR, and will not let managers lose sight of one another. Enterprise-grade durable specifications and 5-year warranty, as well as the convenience of being easily available on the market, in addition to corporate use, ordinary consumers can easily get it.
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