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Joined 1 year ago
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Cake day: July 2nd, 2023

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  • MeanEYE@lemmy.worldtoSelfhosted@lemmy.worldProper HDD clear process?
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    7 months ago

    Like u/MrMcGasion said, zeroing makes it easier to recover original data. Data storage and signal processing is pretty much a game of threshold values. From digital world you might see 0 or 1, but in reality it’s a charge on a certain scale, lets assume 0 to 100%. Anything above 60% would be considered 1 and anything below 45% a 0. Or something like that.

    When you do zero the drive, that means drive will reduce charge enough to pass the lower limit, but it will not be 0 on any account. With custom firmware or special tools it is possible to configure this threshold and all of the sudden it is as if your data was never removed. Add to this situation existence of checksums and total removal of data becomes a real challenge. Hence why all these tools do more than one operation to make sure data is really zeroed or removed.

    For this reason random data is better approach is much better than zeroing because random data alters each block differently instead of just reducing charge by a fixed amount, as it is with zeroing. Additional safety is achieved by multiple random data writes.

    All of this plays a role only on magnetic storage, that is to say HDDs. SSD is a completely different beast and wiping SSD can lead to reduced lifespan of the drive without actually achieving the desired result. SSDs have write distribution algorithms which make sure each of the blocks are equally used. So while your computer thinks it’s writing something at the beginning of the drive, in reality that block can be anywhere on the device and address is just internally translated to real one.




  • Technically they can handle 300 clients, if none of them are talking. With any wireless communication, only one device can talk at a time, maybe two if sending and receiving works on different frequency, which WIFI is not. So no matter what manufacturer says, on 2.4GHz, fewer clients can talk because bandwidth is lower and sending/receiving packets takes time. Whenever possible, stay away from WIFI. The more you use it, the worse it will get.


  • MeanEYE@lemmy.worldtoSelfhosted@lemmy.worldIntroducing Raspberry Pi 5
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    9 months ago

    Love the fact community is already mocking the fact they have distribution issues. While I had Twitter account their PR team was going full force demonstrating how it can be used and promoting projects that use it… all the while it’s out of stock everywhere, constantly. I would have number of sites “notify” me when they are back in stock, only to be sold out seconds after. Luckily kind person shared a site which tracks where it can be purchased and for what amount but the mere fact such a tool has to exist just shows there’s a serious problem.