Why is this in my error log?

[W????n S.]

Event Type: Error
Event Source: Disk
Event Category: None
Event ID: 15
Date: 6/28/2003
Time: 1:55:17 PM
User: N/A
Computer: HOME1
Description:
The device, \Device\Harddisk2\D, is not ready for access yet.

For more information, see Help and Support Center at
http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 0f 03 68 00 01 00 b6 00 ..h...¶.
0008: 00 00 00 00 0f 00 04 c0 .......À
0010: 04 01 00 00 9d 00 00 c0 ....�..À
0018: 00 00 00 00 00 00 00 00 ........
0020: 00 00 00 00 00 00 00 00 ........
0028: 3a 05 00 00 00 00 00 00 :.......
0030: ff ff ff ff 00 00 00 00 ÿÿÿÿ....
0038: 40 00 00 0a 00 00 00 00 @.......
0040: 02 20 0a 12 48 01 20 00 . ..H. .
0048: 08 00 00 00 0a 00 00 00 ........
0050: a0 48 9a f8 20 ba f2 81 Hšø ºò�
0058: 00 00 00 00 70 fe f0 81 ....pþð�
0060: 00 f0 eb 81 00 00 00 00 .ðë�....
0068: 25 00 00 00 00 00 00 00 %.......
0070: 00 00 00 00 00 00 00 00 ........
0078: 00 00 00 00 00 00 00 00 ........
0080: 00 00 00 00 00 00 00 00 ........
0088: 00 00 00 00 00 00 00 00 ........