~~~~~~~Forum Diskusi Software dan Internet untuk Kristen-Katolik~~~~~~~ Burn-ProofT vs JustLinkT http://www.cdrwcentral.com/general/justlinkvburnproof.htm Updated 18/11/2000 These two new technologies claim to prevent the dreaded buffer underrun. So, how well do they do it ? Lets take a look at what each does in terms of preventing a coaster. The cause of Buffer Under Run Error In order to make CD-DA/CD-ROM compatible discs, it is required to write the data constantly on the discs. However, data stream speed is not always constant, especially when starting up some other applications, such as the Internet. Further, if an unexpected error occurs in the source disc, this will create the Buffer Under Run error. These are the typical causes of a Buffer Under Run Error. Once a Buffer Under Run Error has occurred, the disc cannot be read by a CD-ROM or in the worst case, the disc will be useless. So, here enters two companies that have found a way to prevent this from happening. Sanyo's Burn-ProofT This new technology now enables many CD-R/RW drives to record data seamlessly between the end of one recorded point and the start of another recording point, even though data transfer may be suspended due to the occurrence of a Buffer Under Run Error. Burn-ProofT technology helps prevent the creation of a useless disc (coaster disc). Burn-ProofT technology allows the user to multitask on their PC. Previously, a user couldn't do any other work on the PC while recording data. With Burn-ProofT technology you do not have to suspend your work even though you are recording data. Lower performance PCs may also perform high-speed recording. Actual recording speed depends upon the data transfer rate of the PC and the PC's performance. When the CD Recorder starts recording, the status of the buffer is constantly checked. Shortly before a buffer underrun might occur (typically when the buffer falls below 10% of its maximum capacity), the CD Recorder will stop recording as of a specific location on the CD. The CD Recorder continues attempting to receive data from the PC and to refill the buffer. In the meantime, the Burn-ProofT circuit determines where the last successful sector is written. Using the location of the last successful sector, the Burn-ProofT circuit will position the Optical Pickup. As soon as the buffer has been refilled, the CD Recorder will start recording again. Identically Burn-ProofT does not make the overlapped data area and the data-gap area by suspending and restarting to record. However, the data-gap will happen by the Auto Power Control Function for the recording laser as follows. Example:The length of data-gap (unrecorded area) on the disc will be approximately 45 um with 12x speeds. (Updated, see below) The data-gap of around 45 um will be completely corrected by error correction function. An advanced version of Burn-ProofT has been released, length gap has been reduced to 2-5�m from 40 - 45�m to compete with JustLink from Ricoh. Therefore, the disc created by Burn-ProofT can be handled as the usual recorded disc. Burn-ProofT is accomplished by a combination of hardware and firmware that is resident on the drive control electronics. Ricoh's JustLinkT JustLinkT is a new technology developed independently by Ricoh. It automatically prevents buffer underrun errors by predicting them before they happen. This new technology now enables Ricoh's CD-R/RW drives to record data seamlessly between the end of one recorded point and the start of another recording point, even though data transfer may be suspended due to the occurrence of a Buffer Under Run Error. JustLinkT technology allows the user to multitask on their PC. Previously, a user couldn't do any other work on the PC while recording data. With JustLinkT technology you do not have to suspend your work even though you are recording data. Lower performance PCs may also perform high-speed recording. Actual recording speed depends upon the data transfer rate of the PC and the PC's performance. JustLinkT works on the following principal The amount of data, accumulated in the buffer memory, is constantly monitored during writing. If, for some reason, data transfer speed from the computer falls below the writing speed, the amount of data accumulated in the buffer memory falls. When the amount of data in the buffer memory falls below a certain level (this level is un-known at this time), and the possibility of a buffer underrun error is predicted if writing continues, writing is intentionally suspended for the time being. During the time that the writing is suspended, data transferred from the computer accumulates in the buffer memory. When enough data has accumulated, writing is resumed from the point directly after the point where it was suspended, and monitoring of the amount of data in the buffer memory is recommenced. The link section from Ricoh's JustLinkT being 2�m or under is almost imperceptible. The link section from JustLinkT being extremely small at less than 2�m does not affect the reading quality. Tests Tests on Burn-Proof have been carried out here. Burn-ProofT does work as described. Tests on JustLinkT have have been carried out here. JustLinkT does work as described. Which one is best ? Well, this is not going to be easy to answer !! Burn-ProofT and JustLinkT work very well. The Ricoh MP9120A and the drives that have Burn-ProofT that we have tested to date do work as described, both work in exactly the same way at preventing a 'coaster', thus not wasting a blank disc. Over the last few days we have hammered the Ricoh MP9120A and PlexWriter PX-W1210S with all kinds of tests ranging from heavy internet access via our 10/100Mb/s internal Network to the Internet Gateway PC here. While this was going on the drives where set with the task of burning many discs with audio, video and data, each making a VCD disc, an Audio disc, and a data disc. This was done with data being taken from another PC within our internal network here. In most cases, the PC with the CD-RW drives cached the data, that is, the data was taken from the source and cached in the PC with the drives that are going to burn this data. We also tested the drives with PacketCD / DirectCD in much the same way, this was done by using the PC that had the data that we wanted to save, and then sending it across the Network to the PC that had the CD-RW drives (drives need to be shared to do this). Tests on audio were also carried out to see if we could produce a click in the sound track while the drives wrote the disc. We forced the drives to stop recording data by pressing Alt+Ctrl+Del, this froze the PC and in turn stopped the CD Recorders from writing data to the CDR. Pressing Esc to make the CD Recorder resume were they left off. We tested this many times with single tone tracks, the result was that no clicks were detected in any CD's that we made in this way. Conclusion As you can see, Burn-ProofT and JustLinkT work on the same principal, in fact you could say they are the same, but there could be a difference, but we are unable to tell this at this time. Based on the information that we have here, they seem to do the same thing with the buffer on the drives. Both monitor the buffer in the drive, if the buffer falls below a certain point with data, the writing process is paused until the buffer on the drive has been filled with data. CDR/RW applications will need to be modified to support / use Burn-ProofT and JustLinkT, as they are not just hardware dependant. >From all these tests, we have decided that both Burn-ProofT and JustLinkT are the way to go. If you are looking to buy a drive that has 'Anti-coaster Technology' built-in, you will not go far wrong with either the Ricoh MP9120A or any drive that has Burn-ProofT. ------ Hemat Bandwith : Hapus pesan yang tidak perlu sebelum reply ------ SUBSCRIBE---> To: [EMAIL PROTECTED], Isi/Body: kosong UNSUBSCRIBE---> To: [EMAIL PROTECTED], Isi/Body: kosong Moderator: Ronny <[EMAIL PROTECTED]>, Alex <[EMAIL PROTECTED]> Web : http://hub.xc.org/cgi-bin/lyris.pl?enter=i-kan-software
