HDD vs removable media ?
Hi all,
In a Hard disk ,The data platters are completely sealed so that no dust/dirt can get in this feature makes hard disk more reliable than removable media isn't it. Is there any other feature that makes HDD a better proposition than removable media ? |
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Hi,
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CD & DVD do have a carrier that moves the laser assembly. How do you think the read or writes are performed on the drives? No Electronics? :doh: If your speaking of the media then of course no circuitry but alignment via layer bit control that is burnt initially then readable via the laser photo array and circuitry within the device. Quote:
:hattip: |
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In reality, almost no HDD is sealed. All of them have a 'breather hole' which has a filter behind it. This hole is needed to make pressure inside the HDD constant enough so that the spinning disk could make the head float above it with the needed distance. Quote:
So, i wouldn't say HDD is very reliable. I'd rather say this about SSD instead. |
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You should handle this things with care . |
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Hi,
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Only if the drive has accelerometers and electronics designed for such. Not all HDD will have this feature. Any mechanical shock could possibly cause a head crash during operation. Hopefully the user doesn't drop nor bang the system off the wall. As for the SSD, cost vs storage here. Sure durable but at what cost? Density and volatility depends on the type of SSD then add the cost for the bigger units. I believe a spinning HD is still a cheap means of large storage but a slow one compared to solid state based devices with smaller sizes. The density will change for the SSD along with the cost. :hattip: |
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And as for the sealed/unsealed business, I was merely pointing out that sealing the drive is only relevant when compared to another hard drive, it is not an extra or defining point of reliability over removable media. And who ever said that the seal was airtight ? |
Hi,
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No argument with the balance of pressure in the platter chamber but still not active air flow exchange. If so then the recirc filter would just re-introduce particles that had been filtered. These particles are from wear or even manufacture. It doesn't take a very large particle to cause a crash of the head & platter thus damaging the disk or head. The best analogy is a rabbit crossing a runway with a 747 flying 4 inches off the same runway. Something is going to happen when the 747 hits the rabbit. :hattip: |
To the OP
Hard drives are susceptible to magnet fields. A magnetic field can erase or corrupt data. Hard drives have a limited life. There is a motor spinning and heads parking and unparking. I think 20 - 30k parks is the life of one. WD is having problems with their green drives dying early because the darn things park every few seconds if not reading. Drives either dye right away or last for years it seems. Subject to design change. PATA- SATA. SSD's have no moving parts, should last, but are a bit expensive still. Optical media is heat and scratch susceptible. They should last if kept in a good storage climate. CD-R, DVD-R are suppose to last for decades but that can't be proven yet. Plus the formats aren't lasting long enough to find out. 10 years ago we used CD-R. Now single layer DVD's are being replaced by double-quad layer and Blueray. Flash memory is compact and handy. You can puts lots of data in a small space. It also has limited read write life. That's also susceptible to design change. USB is popular now but that could change. I think if you have something valuable to store, put it on different media in different locations. Back it up on magnetic and optical or flash. The major problem about keeping data may not be the reliability of the media but rather the fast obsolescence of the hardware to use your media. |
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