# Cannot use USB diskette drive

**URL:** <https://community.unix.com/t/cannot-use-usb-diskette-drive/237261>\
**Category:** Filesystems, Disks and Memory\
**Created:** [April 8, 2009, 11:29am UTC](https://community.unix.com/t/cannot-use-usb-diskette-drive/237261 "2009-04-08T11:29:56Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![ahjchr](https://community.unix.com/letter_avatar/ahjchr/32/5_5575768a8748004e209b776fc1b2916d.png) [@ahjchr](https://community.unix.com/u/ahjchr)\
**Post date:** [April 8, 2009, 11:29am UTC](https://community.unix.com/t/cannot-use-usb-diskette-drive/237261/1 "2009-04-08T11:29:56Z")

</div>

I would be extremely grateful for any help on the following matter.

Under AIX 5.1 and for years I have been using perfectly well a USB 3.5" disketted drive. But since yesterday, after a power failure disconnected my e-server, I have been unable to use the drive. Whatever \<operation\> I try to execute, let it be "dosread", "dosdir" or "restore" from a backup diskette, I always get:

\<operation\> 054-158 Cannot open /dev/rfd0: there is a request to a device or address that does not exist.

When I enter:

```nohighlight
lsdev -C

```

The answer is:

```nohighlight
fd0 is defined

```

When I enter:

```nohighlight
lscfg -v

```

The answer is:

```nohighlight
fd0 is not listed

```

When I enter:

```nohighlight
mkdev -l fdo

```

The answer is:

```nohighlight
Method error. 0514-031 A device is already configured ....

```