[ubuntu-in] How to verify actual space on a disk (maybe OT)

[Mohamed Khaleel]

In any USB device there is a memory space called device descriptor. This
space has information about the USB device itself. In a USB mass storage
device, the memory size of the pen drive is one of the info. This can be
modified to any number irrespective of the actual physical memory available.
This is exactly what had happened to you. There is no physical memory. The
file system reads this info initially. But when you try to transfer the
data, the FS will not be able to find space on the device.

Regards,
Khaleel


On Mon, Apr 12, 2010 at 5:09 PM, Ramnarayan.K <ramnarayan.k at gmail.com>wrote:

> Hi
>
> Recently a friend of mine brought a USB pen Drive (Flash Disk) of 500
> GB for Rs 1500-/ from Palika Bazaar.
>
> First I don't believe it. However i tried it on my system and checked
> using df -h and it showed 500 GB (free space 498 GB)
>
> Second its formatted to FAT 16.
>
> So my questions
> 1. Incredible as it may be i refuse to belive that this small device
> is actually 500 Gig  so how does one verify that. I could copy data
> and i think it will give up after about 10 GIg or less, but is there
> any other way
>
> 2. What is the max size a FAT 16 partition (and FAT 32) be - i think
> FAT partitions have a limit
>
> would appreciate tips.
>
> ram
> PS if i am wrong i might have to eat an hat so look forward to some
> tips to beat this ridiculous sized thumbdrive
>
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