ddr3 Does your HDD have an RV vibration sensor? Three 2.5″ HDD Tests
solid disks SSD OEMddr3 mechanical hard drives for everyone ddr3 + 8618750919058, although SSDs is decreasing year by year ddr3 , but in terms of capacity / price ratio, there is still a long way to go from the mechanical hard disk. Although HDD has the advantage of large capacity, but now the hard disk storage density is getting higher and higher, the head is too close to the platter, and the current hard disk is becoming more and more fragile, and it is often seen that the mobile hard disk and notebook hard disk are damaged. For 3.5-inch mechanical hard disks, because they are fixed in the chassis or NAS or hard disk boxes for many years, they are not often moved, so the problem of shock resistance is not too serious, and the failure rate is not high. Most notebooks are equipped with HDD mechanical hard disks as standard, and daily work often uses removable hard disks, these two use scenarios inevitably need to be moved frequently, so the shockproof problem of 2.5-inch hard disks is particularly prominent.
many years ago, ThinkPad notebooks have a very eye-catching function called APS Active Hard Disk Protection System (ThinkVantage Active Protection System), the principle is that the notebook has a built-in acceleration sensor, which automatically stops the hard disk operation when vibration is detected to prevent the head from being damaged. The technical principle is simple and practical, ThinkPad’s anti-fall has become a big selling point, I have personally seen ThinkPad fall from the desktop to the ground, the result is intact. For a long time, I have always thought that in addition to ThinkPad, the vibration sensor only exists on the 3.5-inch enterprise hard disk, NAS hard disk, the official name is called “RV rotation vibration sensor”, ordinary HDD can not enjoy. But recently I stumbled upon a 2.5-inch hard drive in my hand that also has this feature. I happened to have three brands and four 2.5-inch HDDs in my hand, so I took it to test it.
test method: read or write large files to the hard disk, and then pick up the hard disk by hand to rotate and shake, and observe the change of file transfer speed.
test object:
of which Samsung was produced after Samsung was acquired by Seagate, and was in the transition period, so the label is still Samsung, and it is estimated that it is also produced by Samsung’s production line (the structure is different from Seagate’s hard disk in the same period), but the brand detected by the computer is Still Seagate. There are also products printed with the Seagate label on the market, and the hardware is exactly the same, which is not detailed here.
three hard disks all use ORICO’s hard disk enclosure, chip ASM1153E, the same firmware, interface USB3.0.
test, it mainly rotates and shakes along the X and Y axes, and the effect is not obvious whether it is rotated or vertically in the Z axis direction.
According to actual tests, HGST’s hard disk is the most sensitive to rotation along the X and Y axes, followed by Seagate. Samsung 2T hard drive is only affected by rotational vibration when writing, and has no effect at all when reading. Curiously, none of these drives are sensitive to vertical wobbling, let alone spinning along the Z axis. As for the free fall, I did not dare to test it, because these hard disks have data. Only a small high free fall was attempted to fall into the hand, and the speed did not change.
why is the hard disk so afraid of rotation in the X and Y axes? I estimate that it is due to the large angular momentum at this time, causing the deformation of the disc and the uneven shift of the bearing force. When I tested it, I also found that when I slowly rotated the hard disk by hand, it would make a humming noise, and the 7200-turn HGST hard disk was more obvious. The vibration in the vertical direction may be relatively safer because the height of the head itself can be changed, and the head is light in weight and the deformation is not large.
for further observation, I removed the circuit boards of all three hard drives. The inside is definitely not openable, and the hard disk must work in a dust-free environment.
, it can be seen that Seagate hard drives use the most economical material, with only three screws and one sensor. The Samsung M9T hard drive has three sensor solder joints, but only one sensor and the other two are empty. HGST hard disk is more realistic, there are sponge pads, there are three different directions of sensors, no cutting corners, and the magnetic head interface has tin protection to prevent oxidation, and the contact points of Samsung hard disks have been oxidized and discolored. Of course, among them, HGST hard drive prices are also the highest. The main controllers of these three are Marvell, do not dismantle do not know, the original is not only solid state drives, mechanical hard disk era Marvell master control occupies a large share.
about screw specifications, Samsung hard drive is T6 plum, Seagate is cross flower, HGST is T4 plum blossom.
is not, my own personal experience, whether it is AWD, Seagate, Samsung, or HGST’s 2.5-inch hard drive, bumping when powered on will definitely damage the file, and when it is serious, it will damage the head. The Western Digital hard drive used before, it is estimated that there is no vibration sensor, and no bumps on the ThinkPad with APS will be damaged. Many years ago, the Seagate 500G, the force of the notebook screen under the heavy buckle will damage the hard disk, resulting in data loss. Even the best quality HGST hard drives, one of them is not available because it fell to the cement floor when reading.
reminds everyone that 2.5-inch mechanical hard disks, including mobile hard disks, are strictly forbidden to bump when powered on! Try to avoid moving! Take it lightly! Important data must be backed up, safety first!
here you can see my previous answers, comment area and other answers There are many cases of hard disk damage, which are worth referencing.
simply put, the 2.5-inch mechanical hard disk can not meet the use of notebooks Even if you don’t fall and move at a high frequency, you see a lot of bad hard disk examples around you. Moreover, today’s general notebooks generally do not have high-quality HGST hard disks, most of which are SMR technology 7mm thin disks, which are more likely to break. It is strongly recommended that after you buy a new notebook, you will remove the mechanical hard disk as a mobile hard disk, and replace the original hard disk with a large-capacity solid-state drive of more than 500G. Even if you buy a cheaper old enterprise MLC hard disk, the reliability is several orders of magnitude higher than the mechanical hard disk, and the speed difference between 400MB/s and 500MB/s is very small.
three hard drives tested with HD Tune. Due to the different storage densities and rotational speeds, the comprehensive reading speed results are similar. However, the 7200-rpm HGST hard disk is leading in access time, and the Seagate 1T will seriously drop 70% of the space due to the use of SMR technology, and the IO will also be seriously reduced, affecting the use. This is reflected in opening Thunderbolt download, while accessing other files in the hard disk will be very stuck, and even music can not be played. The write test was not done, and it was gratifying to see the SMR drop to 14MB/s.
about the detection method of the RV rotation vibration sensor, which should also be applicable to the 3.5-inch mechanical hard disk, but must pay attention not to play too much, the large hard disk is relatively heavy, and it is troublesome to fall. In fact, removing the circuit board can also determine whether there is a sensorless, and the small white square is obvious. Pay attention to the hands without static electricity, not damp.
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