Image data corrupted

After upgrading to Snow leopard I was not able to install any new softwares. Not even Software upgrade. While clicking on the dmg files am getting error saying that "image data corrupted". So I couldn't even upgrade to iTunes9 or 10.6.1.
I did repair through sidk utility but of no use. Any suggestions?

I did try reinstalling Snow leopard but no use, I even did a clean install but of no use. Am not able to install anything when trying to open any dmg file the image data is corrupted. I cant even do the software update, its showing error that the download is corrupted. Any help please?

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    If there are problems with updating or with the permissions then easiest is to download the full version and trash the currently installed version to do a clean install of the new version.
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  • Disk image become corrupt after copied to portable hard drive

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  • How can I minimise data corruption?

    Mac OS X is great, and one of the greatest things it has achieved is an environment so stable that it almost never crashes.
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    Hi, bilbo_baggins.
    You wrote: "What I'd really like to know is, what are the main causes of data corruption..."You've already identified them, but you seem reluctant to implement the procedures needed to mitigate or avoid those causes that can be mitigated or avoided, in particular:• Power outages or power problems.
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    • Hardware problems or failures, e.g. hard drive failures, bad sectors, bad RAM, etc.
    • Bad programming.I can understand your position since:• Not everything one needs to run their computer comes in the box: additional money must be spent.
    • The solutions often seem more complex to implement than they really are. One needs some guidance, which again it does not come in the box, and few books address preventing problems before they occur.Here's my advice:
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    RAID is high on the "geek chic" scale, low on the "average user" practicality scale, and high on the "complex to troubleshoot" scale when problems arise. The average user is better served by implementing a comprehensive Backup and Recovery solution and using it regularly.
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    10. Personal computers today are not much more advanced than automobiles were in the 1920's and '30s: to drive back then, you had to be part mechanic as well as driver. Cars today still require regular maintenance. It's the same with personal computers today: you need to be prepared for troubleshooting them (mechanic) as well as using them (driver). Computer hardware can fail, just as autos can break down, usually at the worst possible moment.
    People whose homes or offices have several Macs, a network, and the other peripherals normally associated with such setups — printers, scanners, etc. — are running their own data centers but don't know it. Educating yourself is helpful: my "Learning About Mac OS X" FAQ has a number of resources that you will find helpful including books, online training, and more. My book focuses exclusively on troubleshooting, with a heavy emphasis on preventing problems before they occur and being prepared for them should they arise.
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    Dr. Smoke
    Author: Troubleshooting Mac® OS X
    Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
    I may receive some form of compensation, financial or otherwise, from my recommendation or link.

  • Images getting corrupted in Lightroom 4.2

    I have experienced this aswell. As mentioned in:
    http://forums.adobe.com/message/4138626
    and http://forums.adobe.com/thread/948417?tstart=0
    My lightroom has after two weeks of playing with a fully working raw file corrupted it.
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    Here's evidence that LR is rewriting an entire JPEG file when I add metadata and do Save Metadata To File, just as Rob has described.
    First, I imported a JPEG in which all the metadata had been stripped using Exiftool.  Exiftool's dump shows that the image data starts at around hex offset 10:
    Immediately after importing, I did Save Metadata To File, and the image data now starts at around hex offset 0cf0:
    Next I added a short caption and did Save Metadata To File, and the image data now starts at around hex offset 0dd0:
    I used the Microsoft Sysinternals' Process Monitor to trace file reads and writes to the JPEG file while LR was doing Save Metadata To File, and that confirms it is writing the entire 1 MB file:
    Obviously, if there's a hardware fault anywhere in the path from the disk to memory and back, the contents of the image data could get corrupted.
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  • Data corrupt block

    os Sun 5.10 oracle version 10.2.0.2 RAC 2 node
    alert.log 내용
    Hex dump of (file 206, block 393208) in trace file /oracle/app/oracle/admin/DBPGIC/udump/dbpgic1_ora_1424.trc
    Corrupt block relative dba: 0x3385fff8 (file 206, block 393208)
    Bad header found during backing up datafile
    Data in bad block:
    type: 32 format: 0 rdba: 0x00000001
    last change scn: 0x0000.98b00394 seq: 0x0 flg: 0x00
    spare1: 0x1 spare2: 0x27 spare3: 0x2
    consistency value in tail: 0x00000001
    check value in block header: 0x0
    block checksum disabled
    Reread of blocknum=393208, file=/dev/md/vg_rac06/rdsk/d119. found same corrupt data
    Reread of blocknum=393208, file=/dev/md/vg_rac06/rdsk/d119. found same corrupt data
    Reread of blocknum=393208, file=/dev/md/vg_rac06/rdsk/d119. found same corrupt data
    Reread of blocknum=393208, file=/dev/md/vg_rac06/rdsk/d119. found same corrupt data
    Reread of blocknum=393208, file=/dev/md/vg_rac06/rdsk/d119. found same corrupt data
    corrupt 발생한 Block id 를 검색해 보면 Block id 가 검색이 안됩니다.
    dba_extents 로 검색
    corrupt 때문에 Block id 가 검색이 안되는 것인지 궁금합니다.
    export 받으면 데이타는 정상적으로 export 가능.

    다행이네요. block corruption 이 발생한 곳이 데이터가 저장된 블록이
    아닌 것 같습니다. 그것도 rman백업을 통해서 발견한 것 같는데
    맞는지요?
    scn이 scn: 0x0000.00000000 가 아닌
    0x0000.98b00394 인 것으로 봐서는 physical corrupt 가 아닌
    soft corrupt인 것 같습니다.
    그렇다면 버그일 가능성이 높아서 찾아보니
    Bug 4411228 - Block corruption with mixture of file system and RAW files
    의 버그가 발견되었습니다. 이것이 아닐 수도 있지만..
    이러한 block corruption에 대한 처리방법 및 원인분석은
    오라클(주)를 통해서 정식으로 요청하셔야 합니다.
    metalink를 통해서 SR 요청을 하십시오.
    export는 high water mark 이후의 block corruption을 찾아내지 못하고 이외에도
    아래 몇가지 경우에서도 찾아내지 못합니다.
    db verify( dbv)의 경우에는 physical corruption은 찾아내지 못하고
    soft block corruption만 찾아낼 수 있습니다.
    경험상 physical corruption 이 발생하였으나 /dev/null로
    datafile copy가 안되는데도 dbv로는 이 문제를 찾아내지
    못하였습니다.
    그렇다면 가장 좋은 방법은 rman 입니다. rman은 high water mark까지의
    데이터를 백업해주면서 전체 데이터파일에 대한 체크를 하기도 합니다.
    physical corruption뿐만 아니라 logical corruption도 체크를
    하니 점검하기로는 rman이 가장 좋은 방법이라 생각합니다.
    The Export Utility
    # Use a full export to check database consistency
    # Export performs a full scan for all tables
    # Export only reads:
    - User data below the high-water mark
    - Parts of the data dictionary, while looking up information concerning the objects being exported
    # Export does not detect the following:
    - Disk corruptions above the high-water mark
    - Index corruptions
    - Free or temporary extent corruptions
    - Column data corruption (like invalid date values)
    block corruption을 정상적으로 복구하는 방법은 restore 후에
    복구하는 방법이 있겠으나 이미 restore할 백업이 block corruption이
    발생했을 수도 있습니다. 그러므로 다른 서버에 restore해보고
    정상적인 datafile인 것을 확인 후에 실환경에 restore하는 것이 좋습니다.
    만약 백업본까지 block corruption이 발생하였거나 또는 시간적 여유가
    없을 경우에는 table을 move tablespace 또는 index rebuild를 통해서
    다른 테이블스페이스로 데이터를 옮겨두고 문제가 발생한 테이블스페이스를
    drop해버리고 재생성 하는 것이 좋을 것 같습니다.(지금 현재 데이터의
    손실은 없으니 move tablespace, rebuild index 방법이 좋겠습니다.
    Handling Corruptions
    Check the alert file and system log file
    Use diagnostic tools to determine the type of corruption
    Dump blocks to find out what is wrong
    Determine whether the error persists by running checks multiple times
    Recover data from the corrupted object if necessary
    Preferred resolution method: media recovery
    Handling Corruptions
    Always try to find out if the error is permanent. Run the analyze command multiple times or, if possible, perform a shutdown and a startup and try again to perform the operation that failed earlier.
    Find out whether there are more corruptions. If you encounter one, there may be other corrupted blocks, as well. Use tools like DBVERIFY for this.
    Before you try to salvage the data, perform a block dump as evidence to identify the actual cause of the corruption.
    Make a hex dump of the bad block, using UNIX dd and od -x.
    Consider performing a redo log dump to check all the changes that were made to the block so that you can discover when the corruption occurred.
    Note: Remember that when you have a block corruption, performing media recovery is the recommended process after the hardware is verified.
    Resolve any hardware issues:
    - Memory boards
    - Disk controllers
    - Disks
    Recover or restore data from the corrupt object if necessary
    Handling Corruptions (continued)
    There is no point in continuing to work if there are hardware failures. When you encounter hardware problems, the vendor should be contacted and the machine should be checked and fixed before continuing. A full hardware diagnostics should be run.
    Many types of hardware failures are possible:
    Bad I/O hardware or firmware
    Operating system I/O or caching problem
    Memory or paging problems
    Disk repair utilities
    아래 관련 자료를 드립니다.
    All About Data Blocks Corruption in Oracle
    Vijaya R. Dumpa
    Data Block Overview:
    Oracle allocates logical database space for all data in a database. The units of database space allocation are data blocks (also called logical blocks, Oracle blocks, or pages), extents, and segments. The next level of logical database space is an extent. An extent is a specific number of contiguous data blocks allocated for storing a specific type of information. The level of logical database storage above an extent is called a segment. The high water mark is the boundary between used and unused space in a segment.
    The header contains general block information, such as the block address and the type of segment (for example, data, index, or rollback).
    Table Directory, this portion of the data block contains information about the table having rows in this block.
    Row Directory, this portion of the data block contains information about the actual rows in the block (including addresses for each row piece in the row data area).
    Free space is allocated for insertion of new rows and for updates to rows that require additional space.
    Row data, this portion of the data block contains rows in this block.
    Analyze the Table structure to identify block corruption:
    By analyzing the table structure and its associated objects, you can perform a detailed check of data blocks to identify block corruption:
    SQL> analyze table_name/index_name/cluster_name ... validate structure cascade;
    Detecting data block corruption using the DBVERIFY Utility:
    DBVERIFY is an external command-line utility that performs a physical data structure integrity check on an offline database. It can be used against backup files and online files. Integrity checks are significantly faster if you run against an offline database.
    Restrictions:
    DBVERIFY checks are limited to cache-managed blocks. It’s only for use with datafiles, it will not work against control files or redo logs.
    The following example is sample output of verification for the data file system_ts_01.dbf. And its Start block is 9 and end block is 25. Blocksize parameter is required only if the file to be verified has a non-2kb block size. Logfile parameter specifies the file to which logging information should be written. The feedback parameter has been given the value 2 to display one dot on the screen for every 2 blocks processed.
    $ dbv file=system_ts_01.dbf start=9 end=25 blocksize=16384 logfile=dbvsys_ts.log feedback=2
    DBVERIFY: Release 8.1.7.3.0 - Production on Fri Sep 13 14:11:52 2002
    (c) Copyright 2000 Oracle Corporation. All rights reserved.
    Output:
    $ pg dbvsys_ts.log
    DBVERIFY: Release 8.1.7.3.0 - Production on Fri Sep 13 14:11:52 2002
    (c) Copyright 2000 Oracle Corporation. All rights reserved.
    DBVERIFY - Verification starting : FILE = system_ts_01.dbf
    DBVERIFY - Verification complete
    Total Pages Examined : 17
    Total Pages Processed (Data) : 10
    Total Pages Failing (Data) : 0
    Total Pages Processed (Index) : 2
    Total Pages Failing (Index) : 0
    Total Pages Processed (Other) : 5
    Total Pages Empty : 0
    Total Pages Marked Corrupt : 0
    Total Pages Influx : 0
    Detecting and reporting data block corruption using the DBMS_REPAIR package:
    Note: Note that this event can only be used if the block "wrapper" is marked corrupt.
    Eg: If the block reports ORA-1578.
    1. Create DBMS_REPAIR administration tables:
    To Create Repair tables, run the below package.
    SQL> EXEC DBMS_REPAIR.ADMIN_TABLES(‘REPAIR_ADMIN’, 1,1, ‘REPAIR_TS’);
    Note that table names prefix with ‘REPAIR_’ or ‘ORPAN_’. If the second variable is 1, it will create ‘REAIR_key tables, if it is 2, then it will create ‘ORPAN_key tables.
    If the thread variable is
    1 then package performs ‘create’ operations.
    2 then package performs ‘delete’ operations.
    3 then package performs ‘drop’ operations.
    2. Scanning a specific table or Index using the DBMS_REPAIR.CHECK_OBJECT procedure:
    In the following example we check the table employee for possible corruption’s that belongs to the schema TEST. Let’s assume that we have created our administration tables called REPAIR_ADMIN in schema SYS.
    To check the table block corruption use the following procedure:
    SQL> VARIABLE A NUMBER;
    SQL> EXEC DBMS_REPAIR.CHECK_OBJECT (‘TEST’,’EMP’, NULL,
    1,’REPAIR_ADMIN’, NULL, NULL, NULL, NULL,:A);
    SQL> PRINT A;
    To check which block is corrupted, check in the REPAIR_ADMIN table.
    SQL> SELECT * FROM REPAIR_ADMIN;
    3. Fixing corrupt block using the DBMS_REPAIR.FIX_CORRUPT_BLOCK procedure:
    SQL> VARIABLE A NUMBER;
    SQL> EXEC DBMS_REPAIR.FIX.CORRUPT_BLOCKS (‘TEST’,’EMP’, NULL,
    1,’REPARI_ADMIN’, NULL,:A);
    SQL> SELECT MARKED FROM REPAIR_ADMIN;
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    4. Skipping corrupt blocks using the DBMS_REPAIR. SKIP_CORRUPT_BLOCK procedure:
    SQL> EXEC DBMS_REPAIR. SKIP_CORRUPT.BLOCKS (‘TEST’, ‘EMP’, 1,1);
    Notice the verification of running the DBMS_REPAIR tool. You have lost some of data. One main advantage of this tool is that you can retrieve the data past the corrupted block. However we have lost some data in the table.
    5. This procedure is useful in identifying orphan keys in indexes that are pointing to corrupt rows of the table:
    SQL> EXEC DBMS_REPAIR. DUMP ORPHAN_KEYS (‘TEST’,’IDX_EMP’, NULL,
    2, ‘REPAIR_ADMIN’, ‘ORPHAN_ADMIN’, NULL,:A);
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    6. The last thing you need to do while using the DBMS_REPAIR package is to run the DBMS_REPAIR.REBUILD_FREELISTS procedure to reinitialize the free list details in the data dictionary views.
    SQL> EXEC DBMS_REPAIR.REBUILD_FREELISTS (‘TEST’,’EMP’, NULL, 1);
    NOTE
    Setting events 10210, 10211, 10212, and 10225 can be done by adding the following line for each event in the init.ora file:
    Event = "event_number trace name errorstack forever, level 10"
    When event 10210 is set, the data blocks are checked for corruption by checking their integrity. Data blocks that don't match the format are marked as soft corrupt.
    When event 10211 is set, the index blocks are checked for corruption by checking their integrity. Index blocks that don't match the format are marked as soft corrupt.
    When event 10212 is set, the cluster blocks are checked for corruption by checking their integrity. Cluster blocks that don't match the format are marked as soft corrupt.
    When event 10225 is set, the fet$ and uset$ dictionary tables are checked for corruption by checking their integrity. Blocks that don't match the format are marked as soft corrupt.
    Set event 10231 in the init.ora file to cause Oracle to skip software- and media-corrupted blocks when performing full table scans:
    Event="10231 trace name context forever, level 10"
    Set event 10233 in the init.ora file to cause Oracle to skip software- and media-corrupted blocks when performing index range scans:
    Event="10233 trace name context forever, level 10"
    To dump the Oracle block you can use below command from 8.x on words:
    SQL> ALTER SYSTEM DUMP DATAFILE 11 block 9;
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