sybase 11.9备份出错问题

Question

Backup Server session id is: &60. &Use this value when executing the
'sp_volchanged' system stored procedure after fulfilling any volume change
request from the Backup Server.
Backup Server: 4.141.2.40: [7] The 'CreateFile' call failed for device
'I:\xhback\xhback1' with error number 32
(进程无法访问文件，因为另一个程序正在使用此文件?.Refer to your operating
system documentation for further details.
Msg 8009, Level 16, State 1:
Server 'xhserver', Line 1:
Error encountered by Backup Server. &lease refer to Backup Server messages for
details.

以上是我出错的信息，原先以为是硬盘出现问题，但检查win2000的系统日志，没有出错，不知什么原因。希望各位大哥指点迷津。