Trying to convert from .img to .vdi using "convertfromraw": VERR_VD_INVALID_SIZE

[fth0]

So, unless you specifically set the 'bs' operand to something non-default, it should be a 512-byte multiple.

No, dd doesn't fill up the last partial block read when writing. You can easily test this with dd if=<existing file> of=testfile bs=512 (with or without the bs argument).

[socratis]

Oh, I get that. You can't have a 1-byte file that gets automagically to 512-bytes when copied. But it will occupy a minimum of 512 on the disk, usually more, like 4096 usually these days.

But if you're doing a 'dd' (which is a sector-level copy) of a disk (not a file), I wouldn't expect a 814188811483 bytes file size output. I would expect either a 814188811264, or a 814188811776 bytes file size (512 divisible), unless an unusual setup occurred. Truth of the matter is, that we haven't even seen the command that the OP used, they just mentioned "I used dd". Yeah, right, I use a computer too...