The drive was hollow in the middle.

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    The 3rd release of SpinRite v6.1 is published and may be obtained by all SpinRite v6.0 owners at the SpinRite v6.1 Pre-Release page. (SpinRite will shortly be officially updated to v6.1 so this page will be renamed.) The primary new feature, and the reason for this release, was the discovery of memory problems in some systems that were affecting SpinRite's operation. So SpinRite now incorporates a built-in test of the system's memory. For the full story, please see this page in the "Pre-Release Announcements & Feedback" forum.
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  • BootAble – FreeDOS boot testing freeware

    To obtain direct, low-level access to a system's mass storage drives, SpinRite runs under a GRC-customized version of FreeDOS which has been modified to add compatibility with all file systems. In order to run SpinRite it must first be possible to boot FreeDOS.

    GRC's “BootAble” freeware allows anyone to easily create BIOS-bootable media in order to workout and confirm the details of getting a machine to boot FreeDOS through a BIOS. Once the means of doing that has been determined, the media created by SpinRite can be booted and run in the same way.

    The participants here, who have taken the time to share their knowledge and experience, their successes and some frustrations with booting their computers into FreeDOS, have created a valuable knowledgebase which will benefit everyone who follows.

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Helping people be more secure online through train
I ran validrive on a no-name "8GB" USB drive that had only 4KB valid. It reported valid regions at the beginning and end but missing regions spread throughout the drive.

test date and time 10/23/2023 at 11:18 AM
declared drive size 8,053,063,680 (8.05GB)
validated drive size 4,096 (4.10KB)
highest valid region 8,053,063,680 (8.05GB)
hub or drive vendor generic
hub or drive product flash_disk
serial number 7a0d99f9

Maybe we should start posting these findings as user reviews on Amazon and other vendors,
Thanks, Steve, for this valuable tool.
  • Like
Reactions: Steve
Yes 4k says the flash is failed, probably the die has massive defects, or is cracked. But can be a fake, where the firmware uses the firmware area to return a valid FAT partition and then has 4k as the start of the FAT, and the final 4k block as the end of drive, which is all the quick format looks for. Only needs 8k of working flash, as most OS systems will not actually verify the second copy of the FAT in any operation, just write to update it, using the first copy info, and only aborting if there is a write error returned by the drive.