WD Gold Datacenter Drives
On April 20, 2016, Western Digital launched the new WD Gold family of hard disk drives. These hard disk drives are designed for maximum performance and reliability in the highly demanding conditions of a datacenter. In fact, they are rated to handle workloads of up to 550 TB per year (1.5 TB per day), with a MTBF rating of up to 2.5 million hours!
Today, we are going to take a look at the 8TB Western Digital Gold hard disk drive. This is one of the two helium-filled WD Gold models to feature a hermetically-sealed chassis with an internal helium environment. That’s not what’s different though. For your convenience, we created a specification comparison of the WD Gold family of datacenter drives :
Specifications | 10TB WD Gold | 8TB WD Gold | 6TB WD Gold | 4TB WD Gold |
---|---|---|---|---|
Model | WD101KRYZ | WD8002FRYZ | WD6002FRYZ | WD4002FYYZ |
HelioSeal Technology | Yes | Yes | No | No |
Advanced Format Technology | Yes (512-byte emulation) | Yes (512-byte emulation) | Yes (512-byte emulation) | No |
Spindle Speed | 7200 RPM | 7200 RPM | 7200 RPM | 7200 RPM |
Cache | 256 MB SDRAM | 128 MB SDRAM | 128 MB SDRAM | 128 MB SDRAM |
Maximum Read / Write Speed | 249 MB/s | 205 MB/s | 226 MB/s | 201 MB/s |
Sequential Read / Write Power Consumption | 7.1 W / 6.7 W | 7.2 W / 7.0 W | 9.3 W / 8.9 W | 9.0 W / 8.7 W |
Random Read / Write Power Consumption | 6.8 W / 5.0 W | 7.4 W / 5.1 W | 9.1 W / 7.1 W | 8.8 W / 7.0 W |
Acoustics (Seek / Idle) | 36 dBA / 20 dBA | 36 dBA / 20 dBA | 36 dBA / 29 dBA | 36 dBA / 29 dBA |
MTBF (hours) | 2.5 million | 2.5 million | 2 million | 2 million |
Warranty | 5 Years | 5 Years | 5 Years | 5 Years |
Now, let’s check out the 8TB WD Gold datacenter hard disk drive!
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Unboxing The 8TB WD Gold Drive
The 8TB WD Gold (WD8002FRYZ) hard disk drive came in a sealed antistatic plastic pack. Notably, it lacked the usual sachet of desiccants. That’s because the drive is hermetically-sealed in the factory, and filled with helium. Also notable is their use of two gold-coloured screws to lock the PCB in place.
To remove the drive, just tear off the top or cut it open, and slide out the drive. Be sure to ground yourself before removing and handling the hard disk drive as static can damage it. In particular, you should try to avoid touching the exposed PCB located on the lower underside of the drive.
Next Page > The 8TB WD Gold, HelioSeal & Media Caching Technologies
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The 8TB WD Gold Datacenter Drive
Despite featuring a hermetically-sealed chassis, the 8TB WD Gold (WD8002FRYZ) datacenter drive looks deceptively like any other 3.5″ desktop hard disk drive. In fact, it has the same label on the top plate, with an uncovered PCB on the underside.
The label has a lot of important information, like the hard drive model, storage capacity as well as its date and place of manufacture. This particular drive was manufactured in Thailand on the 26th of March, 2016. You can also see that the drive uses the Advanced Format Technology to achieve its high storage density.
HelioSeal Technology
The 8TB WD Gold datacenter drive is one of the few hard disk drives in the market to feature the revolutionary HGST HelioSeal technology. It is hermetically sealed at the factory, and filled with helium. The hole, which normally serves as the breather hole in a normal “air-filled” hard disk drive, is likely the port through which the air is extracted and replaced with helium.
Because helium is only 1/7th the density of “regular air”, it allows for less friction conferring the following benefits :
- The lower friction reduces the amount of power required to spin the platters, reducing both energy costs and thermal output.
- Internal turbulence is greatly reduced, which makes tracking more precise and reliable. This indirectly allows for greater areal density.
- The lower power requirement and internal turbulence allow more platters and heads to be added in the same volume of space.
- The completely sealed environment eliminates reliability issues that can occur if breather filters get clogged up with dirt.
The only things stopping helium-filled drives from becoming mainstream are the relatively high cost of helium, and the difficulty in sealing the drive.
Media Caching Technology
This feature was mentioned only perfunctorily in the Western Digital press release, which led many writers to assume that they added a NAND flash cache, like the ones used in SSHDs (examples : 4TB WD Blue SSHD, 1TB WD Blue SSHD). Unfortunately, that’s not true.
The media caching technology used in the WD Gold datacenter drives are also a HGST technology, like HelioSeal. It doesn’t use any additional components, just the existing SDRAM cache and the hard disk drive platters. This is how it works :
[adrotate group=”2″]- Small media cache areas are created in regular intervals across the platters. These are only visible to the drive controller, and are hidden to the computer and operating system.
- Data written to the SDRAM cache are combined and regularly written down to the nearest media cache areas at a higher internal queue depth.
- These dispersed media cache areas boost write performance by greatly reducing head movements as data is written to the drive.
- The write data is simultaneously de-staged, which eliminates burst activity and their impact on reads from the platters.
- In the event of a sudden power-off event, the media cache areas is used to quickly restore the SDRAM cache.
Generally, the media caching technology increases random write performance with a slight boost in read performance.
Next Page > SATA 6 Gb/s, What’s Under The PCB?
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SATA 6 Gb/s
This is a Serial ATA drive, with native support for SATA 6 Gb/s. However, it is backward-compatible so you will have no problem using it with older SATA 3 Gb/s controllers.
The SATA 6 Gb/s interface is necessary for optimal performance since the 8TB WD Gold datacenter drive boasts a maximum sustained internal (platter-to-buffer) transfer rate of 205 MB/s, and a large and fast DDR3 SDRAM cache.
Like all Serial ATA drives, it comes the standard SATA data (left) and power (right) connectors and is hot-pluggable. That means you can connect and disconnect this hard disk drive to the server, computer or NAS while it’s still running.
What’s Under The PCB?
Western Digital has a penchant for keeping all surface-mounted components on the reverse side of the PCB – to prevent static damage and to allow for better cooling. The PCB is protected by a thin foam cutout on the chassis side, with a thermal pad to help transfer heat from the HDD controller to the hard disk drive chassis.
The 8TB WD Gold datacenter drive uses the LSI 7101B hard disk drive controller, and the ST Microelectronics L7229 motor drive controller, which features their proprietary Smooth Drive pseudo-sinusoidal digital drive technology.
[adrotate group=”1″]The 8TB WD Gold datacenter drive boasts a large 128 MB SDRAM cache, courtesy of a Samsung K4B1G1646G-BCK0 chip. This is a DDR3-1600 SDRAM chip with 8 memory banks and timings of 11-11-11. This gives it a peak transfer rate of 400 MB/s.
Finally, the 8TB WD Gold datacenter drive has two shock sensors that allow it to better detect shock and vibration events, and dynamically adjust the flying height of the read/write heads to avoid head crashes.
Next Page > Testing The Drive, Usable Capacity, Platter Profile, Temperature
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Testing The WD Gold 8TB Datacenter Drive
Processors | Intel Core i7-2600K |
Motherboard | Intel DP67BG |
Memory | Four Kingmax 2 GB DDR3-1333 modules |
Graphics Card | NVIDIA GeForce GTX 1060 |
Hard Disk Drives | 8 TB Western Digital Gold 6 TB Western Digital Black 6 TB Western Digital Red 6 TB Western Digital Green 4 TB Western Digital Red Pro 4 TB Western Digital Re 4 TB Western Digital Black Gen. 2 4 TB Western Digital Red 3 TB Western Digital Red 3 TB Western Digital Caviar Green |
Operating System | Microsoft Windows 7 64-bit Microsoft Windows Vista 32-bit |
Testing Methodology
Usable Capacity
The WD Gold 8TB datacenter drive has an official formatted capacity of 8,001,563,222,016 bytes. We checked that out by formatting it in NTFS using Microsoft Windows 7.
The actual formatted capacity was 8,001,427,599,360 bytes, which is about 136 MB lower than the official storage capacity. With about 338 MB allocated to the NTFS file system, the actual usable capacity remained slightly above 8 TB.
Platter Profile
As expected from a premium, datacenter-grade hard disk drive, the platter profile of the WD Gold 8TB datacenter drive was phenomenal. There were absolutely zero dips in throughput that would signify a significant use of replacement sectors. Lots of them would be evidence of poor platter quality.
We also compared its platter profile to that of the 6TB WD Black – Western Digital’s top-of-the-line desktop hard disk drive. We can see that the denser platters allow the 6TB WD Black to achieve a higher throughput initially, but the 8TB WD Gold equalised it at around the 3.5TB point.
Thereafter, the 8TB WD Gold was faster. In fact, at the 6TB point, the 8TB WD Gold was about 36% faster than the 6TB WD Black.
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Maximum Surface Temperature
We monitored the surface temperature of seven hard disk drives during their benchmarks. The following chart shows their operating temperature range, from idle to maximum load. Please note that instead of giving you the absolute numbers, we are showing the temperature delta, which is the difference between the actual temperature and the ambient room temperature.
Despite packing 2 additional platters than the 6TB WD Black, the 8TB WD Gold drive was significantly cooler at full load. In fact, it ran cooler than the 4 TB WD Black Gen. 2, and the 4 TB WD Red Pro drives!
This reduced thermal output (and power consumption) is a key advantage of helium-filled hard disk drives like the 8TB WD Gold drive. When deployed in the hundreds or thousands in a datacenter, the lower energy costs of running them, and keeping them cool, will be very significant.
Next Page > Transfer Rate Range, Disk WinMark Results
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Transfer Rate Range
This chart shows you the range of platter-to-buffer transfer rates from the innermost track to the outermost track. In other words, it shows you the range of disk transfer rates of the hard disk drives (from minimum to maximum).
The 8TB WD Gold drive has an official peak throughput of 205 MB/s, which was confirmed by our tests. In fact, it actually peaked at 209 MB/s. While that puts it ahead of most of the competition, it was still slower than the 6TB WD Black.
This is because the 8TB WD Gold uses platters with slightly lower areal density (about 1,142 GB per platter) than the 6TB WD Black, which boasts 1,200 GB per platter.
Business Disk WinBench 99
The 8TB WD Gold datacenter drive is not optimised for desktop applications, so it’s no wonder that it isn’t the fastest drive in this test. Even so, the 8TB Gold datacenter drive did reasonably well, coming within 12% of the 6TB WD Black.
Hard Disk Drive Model | Capacity | Business Disk WinMark 99 |
Difference | Useful Links | |
Western Digital Black | 6 TB | 26.1 MB/s | + 12.0% | Review | Lowest $ |
Western Digital Green | 6 TB | 25.6 MB/s | + 9.9% | Review | Lowest $ |
Western Digital Black | 4 TB | 24.0 MB/s | + 3.0% | Review | Lowest $ |
Western Digital Red Pro | 4 TB | 23.4 MB/s | + 0.4% | Review | Lowest $ |
Western Digital Gold | 8 TB | 23.3 MB/s | Baseline | – | Lowest $ |
Western Digital Re | 4 TB | 20.4 MB/s | – 12.4% | Review | Lowest $ |
Western Digital Red | 6 TB | 19.4 MB/s | – 16.7% | Review | Lowest $ |
Western Digital Red | 4 TB | 17.5 MB/s | – 24.9% | Review | Lowest $ |
Western Digital Caviar Green | 3 TB | 16.3 MB/s | – 30.0% | Review | Lowest $ |
Western Digital Red | 3 TB | 16.1 MB/s | – 30.9% | Review | Lowest $ |
High-End Disk WinBench 99
Again, the 8TB WD Gold was fast, but it was not exceptionally fast because it’s not optimised for desktop applications.
Hard Disk Drive Model | Capacity | High-End Disk WinMark 99 |
Difference | Useful Links | |
Western Digital Black | 6 TB | 143.0 MB/s | + 7.5% | Review | Lowest $ |
Western Digital Green | 6 TB | 140.0 MB/s | + 5.3% | Review | Lowest $ |
Western Digital Black | 4 TB | 138.0 MB/s | + 3.8% | Review | Lowest $ |
Western Digital Red Pro | 4 TB | 137.0 MB/s | + 3.0% | Review | Lowest $ |
Western Digital Gold | 8 TB | 133.0 MB/s | Baseline | – | Lowest $ |
Western Digital Re | 4 TB | 121.0 MB/s | – 9.0% | Review | Lowest $ |
Western Digital Red | 6 TB | 121.0 MB/s | – 9.0% | Review | Lowest $ |
Western Digital Red | 4 TB | 118.0 MB/s | – 11.3% | Review | Lowest $ |
Western Digital Caviar Green | 3 TB | 114.0 MB/s | – 14.3% | Review | Lowest $ |
Western Digital Red | 3 TB | 107.0 MB/s | – 19.5% | Review | Lowest $ |
Next Page > IO Meter – Random Access Performance
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IO Meter (Random Accesses)
We compared the 8 TB Western Digital Gold to the 6 TB Western Digital Black – the fastest desktop-grade hard disk drive in Western Digital’s arsenal. For more performance comparisons, please take a look at The Hard Disk Drive Performance Comparison Guide.
Random Throughput
Test | WD Gold (8 TB) |
WD Black (6 TB) |
Difference |
512 KB Read | 31.86 MB/s | 31.97 MB/s | – 0.3% |
512 KB Write | 31.34 MB/s | 28.54 MB/s | + 9.8% |
4 KB Read | 0.32 MB/s | 0.32 MB/s | – |
4 KB Write | 0.74 MB/s | 0.39 MB/s | + 89.7% |
Check out the incredible boost in the random write speed, especially for small random writes. The 8TB WD Gold delivered almost double the performance of the 6TB WD Black drive in small random writes, and a 10% boost in performance in large random writes.
This is the key advantage of the HGST media caching technology that Western Digital included into the 8TB WD Gold. This is a tremendous performance advantage in file storage servers that serve hundreds or thousands of users.
Random Access Time
Test | WD Gold (8 TB) | WD Black (6 TB) | Difference |
512 KB Read | 16.45 ms | 16.39 ms | + 0.3% |
512 KB Write | 16.73 ms | 18.36 ms | – 8.9% |
4 KB Read | 12.81 ms | 12.79 ms | + 0.1% |
4 KB Write | 5.54 ms | 10.50 ms | – 47.3% |
As you can see, the HGST media caching technology truly has a significant effect on performance. It cut down the random access time, even though that’s a limitation imposed by physics.
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Random CPU Utilization
Test | WD Gold (8 TB) | WD Black (6 TB) | Difference |
512 KB Read | 0.56 % | 0.60 % | – 6.7% |
512 KB Write | 0.57 % | 0.62 % | – 8.1% |
4 KB Read | 0.35 % | 0.43 % | – 18.6% |
4 KB Write | 0.53 % | 0.37 % | + 43.2% |
The LSI 7101B hard disk drive controller used in the 8TB WD Gold is definitely more powerful than the LSI TT07143 controller used in the 6TB Western Digital Black. The extra processing power was certainly useful in handling the extra media caching duty.
Next Page > IOMeter – Sequential Access Performance
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IO Meter (Sequential Accesses)
We compared the 8 TB Western Digital Gold to the 6 TB Western Digital Black – the fastest desktop-grade hard disk drive in Western Digital’s arsenal. For more performance comparisons, please take a look at The Hard Disk Drive Performance Comparison Guide.
Sequential Throughput
Test | WD Gold (8 TB) | WD Black (6 TB) | Difference |
512 KB Read | 209.29 MB/s | 225.60 MB/s | – 7.2% |
512 KB Write | 209.89 MB/s | 228.38 MB/s | – 8.5% |
4 KB Read | 90.87 MB/s | 94.82 MB/s | – 4.2% |
4 KB Write | 53.91 MB/s | 84.54 MB/s | – 36.2% |
The WD Gold 8TB datacenter drive uses less dense platters, so its sequential throughput is understandably lower than that of the 6TB Western Digital Black. That would account for about a 5% deficit in performance, with the rest due to the drive being optimised for random writes.
In fact, we can see here that the HGST media caching technology actually results in a large drop in small sequential write performance.
Sequential Access Time
Test | WD Gold (8 TB) | WD Black (6 TB) | Difference |
512 KB Read | 2.50 ms | 2.32 ms | + 7.8% |
512 KB Write | 2.51 ms | 2.29 ms | + 9.4% |
4 KB Read | 0.04 ms | 0.04 ms | + 4.2% |
4 KB Write | 0.08 ms | 0.05 ms | + 56.4% |
No surprises here. The 8TB WD Gold is optimised for small random writes, not small sequential writes.
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Sequential CPU Utilization
Test | WD Gold (8 TB) | WD Black (6 TB) | Difference |
512 KB Read | 1.25 % | 1.33% | – 6.0% |
512 KB Write | 1.41 % | 1.50% | – 6.0% |
4 KB Read | 8.66 % | 8.95% | – 3.2% |
4 KB Write | 8.59 % | 9.23% | – 6.9% |
Again, we can see that the LSI 7101B hard disk drive controller used in the 8TB WD Gold is more powerful than the LSI TT07143 controller used in the 6TB Western Digital Black.
Next Page > IOPS Random Scaling Performance
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IOPS Scaling (Random)
In these tests, we tested the drive’s ability to tackle multiple input/output operations. We compared the 8 TB Western Digital Gold to the 6 TB Western Digital Black – the fastest desktop-grade hard disk drive in Western Digital’s arsenal. For more performance comparisons, please take a look at The Hard Disk Drive Performance Comparison Guide.
The LSI 7101B hard disk drive controller used in the 8TB WD Gold is definitely faster than the LSI TT07143 controller use in the 6TB WD Black. However, you can see that Western Digital optimised it for random write performance. Together with the HGST Media Caching Technology, it trades some random read performance, for a big boost in random write performance, particularly in small, random writes.
4 KB Random Read
Outstanding I/Os | WD Gold (8 TB) | WD Black (6 TB) | Difference |
1 | 78 IOPS | 78 IOPS | – 0.1% |
8 | 125 IOPS | 132 IOPS | – 5.6% |
32 | 172 IOPS | 190 IOPS | – 9.5% |
4 KB Random Write
Outstanding I/Os | WD Gold (8 TB) | WD Black (6 TB) | Difference |
1 | 181 IOPS | 95 IOPS | + 89.7% |
8 | 195 IOPS | 95 IOPS | + 104.2% |
32 | 196 IOPS | 96 IOPS | + 104.3% |
512 KB Random Read
Outstanding I/Os | WD Gold (8 TB) | WD Black (6 TB) | Difference |
1 | 61 IOPS | 61 IOPS | – 0.3% |
8 | 89 IOPS | 95 IOPS | – 6.7% |
32 | 98 IOPS | 108 IOPS | – 9.0% |
512 KB Random Write
Outstanding I/Os | WD Gold (8 TB) | WD Black (6 TB) | Difference |
1 | 60 IOPS | 54 IOPS | + 9.8% |
8 | 60 IOPS | 54 IOPS | + 10.1% |
32 | 62 IOPS | 54 IOPS | + 13.3% |
Next Page > IOPS Sequential Scaling Performance
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IOPS Scaling (Sequential)
In these tests, we tested the drive’s ability to tackle multiple input/output operations. Again, we compared the 8 TB Western Digital Gold to the 6 TB Western Digital Black – the fastest desktop-grade hard disk drive in Western Digital’s arsenal. For more performance comparisons, please take a look at The Hard Disk Drive Performance Comparison Guide.
It is obvious that the “price” for almost doubling the small random write performance is poorer sequential read and write performance.
4 KB Sequential Read
Outstanding I/Os | WD Gold (8 TB) | WD Black (6 TB) | Difference |
1 | 22,185 IOPS | 23,150 IOPS | – 4.2% |
8 | 44,074 IOPS | 51,435 IOPS | – 14.3% |
32 | 42,976 IOPS | 51,861 IOPS | – 17.1% |
4 KB Sequential Write
Outstanding I/Os | WD Gold (8 TB) | WD Black (6 TB) | Difference |
1 | 13,162 IOPS | 20,639 IOPS | – 36.2% |
8 | 45,863 IOPS | 46,924 IOPS | – 2.3% |
32 | 47,559 IOPS | 55,433 IOPS | – 14.2% |
512 KB Sequential Read
Outstanding I/Os | WD Gold (8 TB) | WD Black (6 TB) | Difference |
1 | 399 IOPS | 430 IOPS | – 7.2% |
8 | 400 IOPS | 430 IOPS | – 7.0% |
32 | 399 IOPS | 431 IOPS | – 7.5% |
512 KB Sequential Write
Outstanding I/Os | WD Gold (8 TB) | WD Black (6 TB) | Difference |
1 | 398 IOPS | 436 IOPS | – 8.5% |
8 | 395 IOPS | 430 IOPS | – 8.2% |
32 | 399 IOPS | 435 IOPS | – 8.4% |
Next Page > Our Verdict & Award, Lowest Prices, Specifications
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Our Verdict & Award
This is our first review of a helium-filled hard disk drive, and we are very impressed. Even from its specifications alone, we can already see a significant reduction in power consumption and noise levels. These are not minor either.
The helium-filled 8TB WD Gold (WD8002FRYZ) datacenter drive boasts 22% lower power consumption, and is half as loud as the air-filled WD Gold models when they are not seeking. We confirmed these claims during our tests, noting how quiet it was, and how it ran almost as cool as 5400 RPM hard disk drives despite packing 3-4 additional platters than the drives we compared it to!
The 8TB WD Gold datacenter drive achieves its tremendous storage capacity, not by increasing areal density, but by packing 2 additional platters. This is only made possible by filling it with helium, reducing turbulence and friction.
While this allows Western Digital to quickly increase storage capacity, it doesn’t help with its performance. That’s why it was slightly slower than top-of-the-line desktop drives like the 6TB Western Digital Black. That doesn’t meant that the 8TB WD Gold datacenter drive is a slow drive. Far from it. It is a fast drive, but not in the way we expect.
The 8TB WD Gold datacenter drive is optimised for datacenter applications. Hence, it features the HGST media caching technology which trades sequential write performance for a big boost in its small random write performance. This is not a very useful trade-off for desktop users, but a big boon to servers that handle hundreds or thousands of users.
The 8TB WD Gold datacenter drive would be overkill for home or office users, even for NAS applications. But there is no doubt that it would offer a big boost in performance and a tremendous reduction in TCO (Total Cost of Ownership), considering its significantly lower power consumption and thermal output per TB of storage. In light of that, we think the WD Gold 8TB datacenter drive deserves no less than our Reviewer’s Choice Award! Congratulations, Western Digital!
The 8TB WD Gold Specifications
Specifications | WD Gold 8TB Datacenter Hard Disk Drive |
---|---|
Model | WD8002FRYZ |
Form Factor | 3.5 inch |
Platter And Head Count | 7 Platters with 14 Read/Write Heads |
Advanced Format Technology | Yes (512-byte emulation) |
Available Sectors | 15,628,053,168 (512-byte emulation) sectors 1,953,506,646 (4,096-byte physical) sectors |
Formatted Capacity | 8,001,563,222,016 bytes |
Native Command Queuing | Yes |
Interface | SATA 6 Gb/s |
Spindle Speed | 7200 RPM |
Sustained read / write performance | 205 MB/s (maximum) |
Cache | 128 MB DDR3-1600 SDRAM |
Average Power Consumption | Sequential read : 7.2 W Sequential write : 7.0 W Random read / write : 7.4 W Idle : 5.1 W |
Temperature Rating | 5 to 60 °C (Operating) -40 to 70 °C (Non-Operating) |
Shock Rating | Operating : 70 G (half-sine wave, 2 ms) Non-Operating : 300 G (half-sine wave, 1 ms) / 150 G (half-sine wave, 11 ms) |
Acoustics | Seek : 36 dBA (average) Idle : 20 dBA |
Load / Unload Cycles | 600,000 |
Non-Recoverable Read Errors per Bits Read | <1 in 1015 |
MTBF (Maximum Time Before Failure) | 2,500,000 hours |
AFR (Average Failure Rate) | 0.35% |
Warranty | 5 Years |
Physical Dimensions | 101.6 mm (4.0") wide x 147.0 mm (5.787") long x 26.1 mm (1.028") high |
Weight | 650 g (1.43 lbs) |
Lowest Prices
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