How do you tell the two apart? CDr media generally will not have matrix information at all while CDs always will. Some CDr media have a green or blue-green tinge in color which you won't see on a CD. Show this post CDr means the data on it was written onto the disc after the disc was manufactured. CD means the media was pressed, completely manufactured, with all the data in place. The pressing process will include a Matrix runout information, almost all the time.
There can be two different lasers. Some have a rubber-like drive belt. Some have very poorly manufactured motors.
Apart from the cost of encryption and decryption operations, the other sources of performance overhead on the client side are:. This section describes the built-in performance optimizations in the ODBC Driver for SQL Server and how you can control the impact of the above two factors on performance.
If Always Encrypted is enabled for a connection, the driver will, by default, call sys. This stored procedure analyzes the query statement to find out if any parameters need to be encrypted, and if so, returns the encryption-related information for each parameter to allow the driver to encrypt them. The above behavior ensures a high-level of transparency to the client application: The application and the application developer does not need to be aware of which queries access encrypted columns, as long as the values targeting encrypted columns are passed to the driver in parameters.
Beginning in version To control the performance impact of retrieving encryption metadata for parameterized queries, you can alter the Always Encrypted behavior for individual queries if it has been enabled on the connection. This way, you can ensure that sys. Note, however, that by doing so, you reduce transparency of encryption: if you encrypt additional columns in your database, you may need to change the code of your application to align it with the schema changes.
If most of the queries of a client application access encrypted columns, the following is recommended:. This will disable both calling sys. This will disable calling sys. Results containing encrypted columns will continue to be decrypted. Use prepared statements for queries which will be executed more than once; prepare the query with SQLPrepare and save the statement handle, reusing it with SQLExecute each time it is executed.
This is the preferred approach for performance even when there are no encrypted columns, and allows the driver to take advantage of cached metadata. A non-zero value causes the driver to return an error when no encryption metadata is returned for the associated parameter. If SQL Server informs the driver that the parameter does not need to be encrypted, queries using that parameter will fail.
This provides additional protection against security attacks which involve a compromised SQL Server providing incorrect encryption metadata to the client, which may lead to data disclosure. To reduce the number of calls to a column master key store to decrypt column encryption keys, the driver caches the plaintext CEKs in memory. The CEK cache is global to the driver and not associated with any one connection. After receiving the ECEK from database metadata, the driver first tries to find the plaintext CEK corresponding to the encrypted key value in the cache.
The driver calls the key store containing the CMK only if it cannot find the corresponding plaintext CEK in the cache. This means that for a given ECEK, the driver contacts the key store only once during the lifetime of the application or every two hours, whichever is less.
Due to the global nature of the cache, this attribute can be adjusted from any connection handle valid for the driver. If it is 0, no CEKs are cached. By default, this attribute is NULL, which means that the driver accepts any key path. The memory pointed to by this attribute must remain valid during encryption or decryption operations using the connection handle on which it is set upon which the driver will check if the CMK path as specified by the server metadata is case-insensitively in this list.
If the CMK path is not in the list, the operation fails. The application can change the contents of memory this attribute points at, to change its list of trusted CMKs, without setting the attribute again. To encrypt or decrypt data, the driver needs to obtain a CEK that is configured for the target column.
The database metadata does not store the CMK itself; it only contains the name of the keystore and information which the keystore can use to locate the CMK.
Unsourced material may be challenged and removed. May Learn how and when to remove this template message. A polycarbonate disc layer has the data encoded by using bumps. A shiny layer reflects the laser.
A layer of lacquer protects the shiny layer. Artwork is screen printed on the top of the disc. A laser beam reads the CD and is reflected to a sensor, which converts it into electronic data. This section does not cite any sources. Please help improve this section by adding citations to reliable sources.
Main article: Compact Disc Digital Audio. Main article: Super Audio CD. Main article: Video CD. Main article: Super Video CD. Main article: Photo CD. Main article: Philips CD-i. Main article: CD-i Ready. Main article: Blue Book CD standard. Main article: VinylDisc. Main article: CD manufacturing. Main article: CD-R. Main article: CD-RW.
Springer Handbook of Lasers and Optics. BBC News. Archived from the original on 18 February Retrieved 1 December The New York Times. Archived from the original on 1 May Archived from the original on 14 April Retrieved 1 July Archived from the original on 20 September Retrieved 22 September Archived PDF from the original on 4 April Retrieved 2 July Patent 3,, Analog to digital to optical photographic recording and playback system, March Patent 3,, Method and apparatus for synchronizing photographic records of digital information, March The Seattle Times.
Archived from the original on 10 August Retrieved 24 July Reed College public affairs office. Archived from the original on 9 October Russell - The Compact Disc".
December Archived from the original on 17 April Philips Research. Retrieved 7 June Schouhamer Immink Retrieved 6 February Design and Culture. Archived from the original on 16 December Retrieved 9 January Australian Broadcasting Corporation. Archived from the original on 23 November Retrieved 9 January — via YouTube. You can use this command to enable it:. Make sure local syslogs are Enabled and set to error. Provided there are all the database alerts we have and can trap on. With CUCM 6.
This error message is received:. Restart these system services in order to resolve the issue:. In a system that supports clusters Cisco Unified Communications Manager only , the service exists on the first server. It receives SOAP requests for CDR file name lists that are based on a user-specified time interval up to a maximum of 1 hour and returns a list of file names that fit the time duration that is specified in the request.
With Cisco Unified Communications Manager 7. Because this appears to be a cosmetic error, you can disable the RTMT alert related to the error message. How satisfied are you with this response? In reply to A. User's post on March 21, Hi, there are 2 problems The first is that my laptop cannot burn cds. In reply to Clarky's post on March 21, Hi Clarky, Thank you for your response.
Keep us posted to help you better. Many thanks. Unfortunately my laptop is still not able to format cds. I had no Upper Filter so removed the Lower Filter. After a restart and going to the same subkey there is no Lower or Upper registry entry now, if there is supposed to be. Are there any other options? Please let us know what happens to help you better.
Hi, I can copy files to pen drives and I can watch dvd and rip music cds. You cant copy the registry keys of other systems and make changes pasting in your system.Aug 25, · Cisco CDR files on CM server Cisco CDR files on Publisher Processed; Check All Servers for both the above services. Click Next, and again click Next. Give the appropriate time range for which you want to collect raw CDR data. Specify a Download File Directory and zip the files. Click Finish. Collect the files. Pull the Report for the PRIs using.