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Re: [Qemu-block] [Qemu-devel] [RFC 10/10] fdc: change default drive to 2
From: |
John Snow |
Subject: |
Re: [Qemu-block] [Qemu-devel] [RFC 10/10] fdc: change default drive to 288 |
Date: |
Mon, 06 Jul 2015 08:41:55 -0400 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
On 07/05/2015 10:53 AM, Kevin O'Connor wrote:
> On Tue, Jun 30, 2015 at 09:20:40PM -0400, John Snow wrote:
>> The 2.88 drive is more suitable as a default because
>> it can still read 1.44 images correctly, but the reverse
>> is not true.
>>
>> Since there exist virtio-win drivers that are shipped on
>> 2.88 floppy images, this patch will allow VMs booted without
>> a floppy disk inserted to later insert a 2.88MB floppy and
>> have that work.
>
> On real machines, 1.44MB floppy drives were very common. It was
> exceptionally rare to see 2.88MB floppy drives though. There is a
> risk that changing the default to an exotic piece of hardware will
> expose quirks in guest Operating Systems.
>
> -Kevin
>
Definitely.
Which is why I do want to add some properties to allow users to help
guide the type of floppy drive they get. 2.88MB might well be a saner
default for when no diskette is inserted (It allows for, I believe, the
widest choice of likely types to be inserted later.)
Windows (MSDOS through Windows8) and Linux both seem completely fine,
which I think represents the lion's share of likely guests.
For other guests, you can always tweak the CLI to provide a drive type
the guest can use.