virtualbox.org

I'm running VirtualBox 4.2.6 with the Extensions installed on a Windows 7 laptop. I'm trying to attach an IMG file that is 1 gigabyte in large with a block size of 4096 to my virtual machine, but all I get is:

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Failed to open the floppy image <path redacted by me>.

Could not get the storage format of the medium '<path redacted by me>' (VERR_NOT_SUPPORTED).

Result Code: VBOX_E_IPRT_ERROR (0x80BB0005)
Component: Medium
Interface: IMedium {29989373-b111-4654-8493-2e1176cba890}
Callee: IVirtualBox {3b2f08eb-b810-4715-bee0-bb06b9880ad2}
Callee RC: VBOX_E_OBJECT_NOT_FOUND (0x80BB0001)

What gives?

I don't think that a floppy controller can handle that size.
What is the image? Is it from dd?

I created the image using:

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dd if=/dev/zero of=DUET.img bs=4096 count=262144

In that case the blocksize info given in the first post was meaningless. You created a binary file of size 4Kx256MB == 1GB filled with zeros. It has no internal structure. At one gig it's way too large to be a floppy, you could however create a VMDK text descriptor for it and mount it as a hard disk... though I'm wondering why you wouldn't just use "VBoxManage createhd" to do the whole thing in one step.

It's my experience that USB images are usually stored as IMG files and I used an IMG to install Android before, so I figured that an IMG file would be the best way to approximate a real USB since I can't seem to get the guest to recognize it [my USB drive].

A flash drive image is basically the same as a hard disk image. The file extension is not important, the internal structure is. As I mentioned earlier, if your goal is to manipulate a fixed size image then the best way IMHO is via a VMDK descriptor as discussed e.g. in this thread.

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