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I got this error when running a backup to tape, do you know what may have caused this? Thank you.

Type: Dataset copy
Status: Failed
Description: DPM encountered a critical error while performing an I/O operation on the tape capfile1-00000021 (_CAPDPM_1000000002X) (Barcode - _CAPDPM_1000000002X) in Drive Firestreamer Tape Drive (L0TD040DE334A7E328E01189EA00505). (ID 30101 Details: Data error (cyclic redundancy check) (0x80070017))
More information
End time: 4/2/2011 11:55:00 PM
Start time: 3/31/2011 11:17:24 PM
Source Library: Firestreamer Media Changer
Source Tape (Barcode): capfile1-00000020 (_CAPDPM_1000000003M)
capfile1-00000021 (_CAPDPM_1000000002X)

Destination Tape (Barcode): capnc-00000020 (_CAPDPM_1000000002J)
capfile1-00000029 (_CAPDPM_10000000020)

Destination Library: Firestreamer Media Changer

Log Name: Application
Source: FsHelperSvc
Date: 4/2/2011 11:54:38 PM
Event ID: 30010
Task Category: None
Level: Error
Keywords: Classic
User: N/A
Computer: capdpm.cap-mpt.com
Description:
04/02/2011 23:54:38 | Error | E010 | L1T005 | Unable to read data from the medium. | file://D:\dpm_tapes\_CAPDPM_1000000002X.fsrm*124928 | _CAPDPM_1000000002X
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="FsHelperSvc" />
<EventID Qualifiers="0">30010</EventID>
<Level>2</Level>
<Task>0</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2011-04-03T06:54:38.000000000Z" />
<EventRecordID>4211</EventRecordID>
<Channel>Application</Channel>
<Computer>capdpm.cap-mpt.com</Computer>
<Security />
</System>
<EventData>
<Data>04/02/2011 23:54:38 | Error | E010 | L1T005 | Unable to read data from the medium. | file://D:\dpm_tapes\_CAPDPM_1000000002X.fsrm*124928 | _CAPDPM_1000000002X</Data>
</EventData>
</Event>

Check the Activity view of the Firestreamer Snap-In for error messages. It should contain a more specific error code related to the failed file read operation. It's likely to be a disk or network problem.