Windows 8 and 8.1 Forums


File or directory is corrupt or unreadable.

  1. #11


    Posts : 185
    W10 Pro/W8.1 Pro/ W7 Ult


    Quote Originally Posted by CountMike
    Good, USB interface introduces another layer interface and may not conform to all standards SATA does so you may not see all the attributes
    Is this in response to my post "No abnormal attributes were detected"? Note that this test was done after removing the USB to SATA adaptor.

    HDDs are sensitive to movements and any sudden move or jerk can introduce errors in writing as well as reading or even head crash which can cause permanent damage to disk surface or heads.
    This does not seems to have nothing to do with the interface, USB or SATA.

    The issue here as I see it is what caused the problem: The hard drive itself, SATA-USB adaptor, or anything else like USB controller chipset, etc. What is the probability of each of these possible causes? Depending on the assessment, I decide whether to restore the USB-SATA adaptor.

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  2. #12


    If you don't need to carry it around a lot, than you're better off to leave it inside the desktop case. Constant running is not going to shorten it's life. I would say that USB cord and connector have a greatest chance to screw something up.
    I use something like this just for USB2. Startech USB 3.0 to 2.5 inch SATA III Hard Drive Adapter Cable with UASP: Amazon.co.uk: Computers & Accessories so i can connect some HDDs sitting around to do backups without having to turn computer off or to dig in.
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  3. #13


    Posts : 185
    W10 Pro/W8.1 Pro/ W7 Ult


    You appear to suggest that I use a new USB-SATA adaptor cable because "USB cord and connector have a greatest chance to screw something up." I wonder, even if the cable is bad, how come the bad cable can cause the file corruption despite of its capability to withstand hot plug/unplug.

    BTW I have such adapter cable as Apricorn USB3 to SATA Adapter .
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  4. #14


    Quote Originally Posted by churin View Post
    You appear to suggest that I use a new USB-SATA adaptor cable because "USB cord and connector have a greatest chance to screw something up." I wonder, even if the cable is bad, how come the bad cable can cause the file corruption despite of its capability to withstand hot plug/unplug.

    BTW I have such adapter cable as Apricorn USB3 to SATA Adapter .
    During the writing to disk, if it's interrupted in any way, usual result is file corruption. Bits are not written only at storage space but also in address space at the beginning of the disk and any disturbance to it can result in part or whole disk/partition to become corrupted. That happens even during reading to disk, bits are written to change flags for each file, when it was last accessed, changed etc.
    All of that and more happens even when disk is connected internally and bad SATA cables are known to produce same errors too. It's just that SATA to USB are not only cables but contain fair bit of electronics to convert SATA signals to USB and other way around and that's the other "layer" I was talking about that introduces more possibility for something to go wrong. Murphy never sleeps.
    There's heck of more things going on in storage that is not apparent to user and every step has potential for something to go wrong. Many steps in between are taken in the background to prevent errors but Murphy never sleeps.
    So, KISS principle applies to storage too.
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  5. #15


    Posts : 185
    W10 Pro/W8.1 Pro/ W7 Ult


    Quote Originally Posted by CountMike View Post
    During the writing to disk, if it's interrupted in any way, usual result is file corruption. Bits are not written only at storage space but also in address space at the beginning of the disk and any disturbance to it can result in part or whole disk/partition to become corrupted. That happens even during reading to disk, bits are written to change flags for each file, when it was last accessed, changed etc.
    All of that and more happens even when disk is connected internally and bad SATA cables are known to produce same errors too. It's just that SATA to USB are not only cables but contain fair bit of electronics to convert SATA signals to USB and other way around and that's the other "layer" I was talking about that introduces more possibility for something to go wrong. Murphy never sleeps.
    There's heck of more things going on in storage that is not apparent to user and every step has potential for something to go wrong. Many steps in between are taken in the background to prevent errors but Murphy never sleeps.
    So, KISS principle applies to storage too.
    The file data transfer take place from 1)hd to 2)cable(wires), 3)SATA-to-USB adapter, 4)cable(usb) and 5)pc or other way around. You indicate the cause of the file corruption is due to possible disruption/interruption within 2), 3) or 4). I understand that 2) or 3) can be the culprit but not 4) because the USB device is supposed to withstand hot swap or hot plug/unplug. Did I misunderstand the meaning of "hot swap" spec?
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  6. #16


    Hot swap does not include interrupting writes. only that you can connect/disconnect devices without turning computer off. Ideally you should use "Safely remove hardware and eject media" before unplugging. It writes data left in cache (in RAM and disk) and eventually shuts disk down.
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  7. #17


    Posts : 185
    W10 Pro/W8.1 Pro/ W7 Ult


    My understanding about the hot swap is as follows:
    The hot swap spec does not include any close that says file corruption may result from the hot swap operation if done while file writing operation is being taken place. Another word, any usb device in a system which supports the hot swapping, can not be harmed while the hot swapping.
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  8. #18


    Got to look at it this way. A program (thru OS) reads data from a storage device, it gets transferred to RAM and channeled thru interface to another storage device to its cache and than to proper place (address) on final destination. If there's any interruption anywhere, data doesn't (or just partially) can't be saved to that storage device because it didn't get there in first place. Now, in theory at least, that shouldn't do any damage to other data on disk, only the file in question but... For data to be written, head has to visit part of the disk where addresses are stored for every block in storage area and if it's interrupted than, it can corrupt part or all of that address space (think of it as an index in a book).
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  9. #19


    Posts : 185
    W10 Pro/W8.1 Pro/ W7 Ult


    It goes without saying that file transfer can not be completed if the USB storage device is unplugged while the transfer is being done.
    The present problem appears to be due to corruption of the partition table. My point is that that is not supposed to happen, otherwise it is not hot swap capable system.
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  10. #20


    Quote Originally Posted by churin View Post
    It goes without saying that file transfer can not be completed if the USB storage device is unplugged while the transfer is being done.
    The present problem appears to be due to corruption of the partition table. My point is that that is not supposed to happen, otherwise it is not hot swap capable system.
    Of course it's not supposed to happen but it did happen and most probably by datus interaptus during the writing to it.
      My System SpecsSystem Spec

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