a few of the readpds errors encoutered:

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data=readpds('/home/reduce/Desktop/PDS-SBN/APRIL06-REVIEW/DEEP_IMPACT/CRUISE/browse/browse.lbl')
Now verifying label for: /home/reduce/Desktop/PDS-SBN/APRIL06-REVIEW/DEEP_IMPACT/CRUISE/browse/browse.lbl
% Compiled module: VERIFY_LABEL.
% CHECK_SFDU_PDS: Error: No PDS_VERSION_ID keyword found in label.
% Error occurred at: CHECK_SFDU_PDS     82 /home/reduce/Desktop/PDS-SBN/READPDS/verify_label.pro
%                    VERIFY_LABEL      295 /home/reduce/Desktop/PDS-SBN/READPDS/verify_label.pro
%                    READPDS           106 /home/reduce/Desktop/PDS-SBN/READPDS/readpds.pro
%                    $MAIN$
% Execution halted at: $MAIN$

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IDL> data=readpds('/home/reduce/Desktop/PDS-SBN/APRIL06-REVIEW/DEEP_IMPACT/CRUISE/index/index.lbl')
% CHECK_COLUMN_OBJECTS: Error: ROW_BYTES (1681) does not equal actual total COLUMN bytes (1678)
% Error occurred at: CHECK_COLUMN_OBJECTS  270 /home/reduce/Desktop/PDS-SBN/READPDS/verify_table.pro
%                    VERIFY_TABLE      303 /home/reduce/Desktop/PDS-SBN/READPDS/verify_table.pro
%                    CHECK_OBJECTS     266 /home/reduce/Desktop/PDS-SBN/READPDS/verify_label.pro
%                    VERIFY_LABEL      307 /home/reduce/Desktop/PDS-SBN/READPDS/verify_label.pro
%                    READPDS           106 /home/reduce/Desktop/PDS-SBN/READPDS/readpds.pro
%                    $MAIN$
% Execution halted at: $MAIN$

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IDL> data=READPDS('/home/reduce/Desktop/PDS-SBN/APRIL06-REVIEW/DEEP_IMPACT/CRUISE/072/hv0164027491_1700001_001.lbl')
Now reading header: /home/reduce/Desktop/PDS-SBN/APRIL06-REVIEW/DEEP_IMPACT/CRUISE/072/hv0164027491_1700001_001.lbl
Now verifying label for: /home/reduce/Desktop/PDS-SBN/APRIL06-REVIEW/DEEP_IMPACT/CRUISE/072/hv0164027491_1700001_001.lbl
% CHECK_KEYS_VALUES: Error: No value for keyword found QUATERNION                             =
% Error occurred at: CHECK_KEYS_VALUES  111 /home/reduce/Desktop/PDS-SBN/READPDS/verify_label.pro
%                    VERIFY_LABEL      299 /home/reduce/Desktop/PDS-SBN/READPDS/verify_label.pro
%                    READPDS           106 /home/reduce/Desktop/PDS-SBN/READPDS/readpds.pro
%                    $MAIN$
% Execution halted at: $MAIN$

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IDL> im=readpds('/home/reduce/Desktop/PDS-SBN/APRIL06-REVIEW/DEEP_IMPACT/ENCOUNTER_RAW/177/hv0173034869_6002613_001.lbl')
Now reading header: /home/reduce/Desktop/PDS-SBN/APRIL06-REVIEW/DEEP_IMPACT/ENCOUNTER_RAW/177/hv0173034869_6002613_001.lbl
Now verifying label for: /home/reduce/Desktop/PDS-SBN/APRIL06-REVIEW/DEEP_IMPACT/ENCOUNTER_RAW/177/hv0173034869_6002613_001.lbl
% CHECK_KEYS_VALUES: Error: No value for keyword found QUATERNION                             =
% Error occurred at: CHECK_KEYS_VALUES  111 /home/reduce/Desktop/PDS-SBN/READPDS/verify_label.pro
%                    VERIFY_LABEL      299 /home/reduce/Desktop/PDS-SBN/READPDS/verify_label.pro
%                    READPDS           106 /home/reduce/Desktop/PDS-SBN/READPDS/readpds.pro
%                    $MAIN$
% Execution halted at: $MAIN$

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IDL> im=readpds('/home/reduce/Desktop/PDS-SBN/APRIL06-REVIEW/DEEP_IMPACT/ENCOUNTER_RED/171/hv0172530812_6002020_001_rr.lbl')
Now reading header: /home/reduce/Desktop/PDS-SBN/APRIL06-REVIEW/DEEP_IMPACT/ENCOUNTER_RED/171/hv0172530812_6002020_001_rr.lbl
Now verifying label for: /home/reduce/Desktop/PDS-SBN/APRIL06-REVIEW/DEEP_IMPACT/ENCOUNTER_RED/171/hv0172530812_6002020_001_rr.lbl
% CHECK_KEYS_VALUES: Error: No value for keyword found QUATERNION                             =
% Error occurred at: CHECK_KEYS_VALUES  111 /home/reduce/Desktop/PDS-SBN/READPDS/verify_label.pro
%                    VERIFY_LABEL      299 /home/reduce/Desktop/PDS-SBN/READPDS/verify_label.pro
%                    READPDS           106 /home/reduce/Desktop/PDS-SBN/READPDS/readpds.pro
%                    $MAIN$
% Execution halted at: $MAIN$

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IDL> im=readpds('/home/reduce/Desktop/PDS-SBN/APRIL06-REVIEW/DEEP_IMPACT/ENCOUNTER_RED/calib/abscalvs/hrivis_050112_3_0_8.lbl')
Now reading header: /home/reduce/Desktop/PDS-SBN/APRIL06-REVIEW/DEEP_IMPACT/ENCOUNTER_RED/calib/abscalvs/hrivis_050112_3_0_8.lbl
Now verifying label for: /home/reduce/Desktop/PDS-SBN/APRIL06-REVIEW/DEEP_IMPACT/ENCOUNTER_RED/calib/abscalvs/hrivis_050112_3_0_8.lbl
% Compiled module: VERIFY_QUBE.
% Compiled module: VERIFY_ARRCOL.
% Compiled module: PREPLABEL.
% Compiled module: OBJPDS.
% Compiled module: IMAGEPDS.
% Compiled module: GET_IDL_TYPE.
% Array dimensions must be greater than 0.
% Error occurred at: OBTAIN_IMAGE_STRUCTURE  174 /home/reduce/Desktop/PDS-SBN/READPDS/imagepds.pro
%                    IMAGEPDS          342 /home/reduce/Desktop/PDS-SBN/READPDS/imagepds.pro
%                    READPDS           122 /home/reduce/Desktop/PDS-SBN/READPDS/readpds.pro
%                    $MAIN$
% Execution halted at: $MAIN$