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| Agilent HP 54831D advice |
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| ARF:
In addition, many SSDs seem to have issues with slower UDMA modes (UDMA/33) and PIO modes on certain controllers, which then usually results in silent data corruption. UDMA-33 mode limits if LS-120 drive connected to first channel. It work only UDMA-33! If you connect it to internal CD, and internal CD already connected to second IDE channel. CD and LS-220 will good work with UDMA-33 speed (it easy make on stock cables) First channel connect your SSD or HDD, and it will be work on UDMA-100 mode. |
| Howardlong:
--- Quote from: ARF on November 20, 2015, 02:33:51 pm ---In addition, many SSDs seem to have issues with slower UDMA modes (UDMA/33) and PIO modes on certain controllers, which then usually results in silent data corruption. UDMA-33 mode limits if LS-120 drive connected to first channel. It work only UDMA-33! If you connect it to internal CD, and internal CD already connected to second IDE channel. CD and LS-220 will good work with UDMA-33 speed (it easy make on stock cables) First channel connect your SSD or HDD, and it will be work on UDMA-100 mode. --- End quote --- For fear of necroposting allegations, I will add that it's been over a year now and the PATA SDD I installed has worked flawlessly. When running in equivalent time, this 600MHz scope has a bandwidth well over 1GHz, and about 850MHz in real time. Biggest downside is still boot time and when it decides to run an autoupdate, maybe I should disable that! |
| Wuerstchenhund:
--- Quote from: ARF on November 20, 2015, 02:33:51 pm ---In addition, many SSDs seem to have issues with slower UDMA modes (UDMA/33) and PIO modes on certain controllers, which then usually results in silent data corruption. UDMA-33 mode limits if LS-120 drive connected to first channel. It work only UDMA-33! If you connect it to internal CD, and internal CD already connected to second IDE channel. CD and LS-220 will good work with UDMA-33 speed (it easy make on stock cables) First channel connect your SSD or HDD, and it will be work on UDMA-100 mode. --- End quote --- The problem I mentioned has absolutely nothing to do with what channel is used so you're missing the point. It all comes down to the simple fact that all UDMA modes faster than UDMA/33 require an 80 conductor cable which has additional ground wires to reduce interference, and (while specified) no 80 conductor cable exists for the 2.5" 44pin EIDE interface, which means any device (hard disk, SSD, whatever) should not be operated at faster than UDMA/33 mode if it uses a 44pin interface and is connected via a cable (instead of plugging directly into the connector). However, while most mainboards check for the presence of an 80 conductor cable before switching into faster modes than UDMA/33, they don't do that for 44pin connections because no 80 conductor cable exists. This isn't much of a problem for the slow 2.5" PATA notebook drives like the ones used in those scopes as they rarely support more than UDMA/33, however in combination with a PATA SSD which usually supports up to UDMA/133 modes this can (and often does!) lead to silent data corruption. This is why Transcend has put a fix in the firmware of their newer PATA SSDs (i.e. PSD330) to prevent this problem. --- Quote from: Howardlong on November 20, 2015, 04:17:14 pm ---When running in equivalent time, this 600MHz scope has a bandwidth well over 1GHz, and about 850MHz in real time. --- End quote --- Not sure I can follow you here. Aside from the fact that 4GSa/s should be absolutely sufficient for resolving 1GHz signals, the scope still has a 600MHz front end through which all input signals must pass, and which has a frequency response that is completely independent of the type of sampling used. I'd expect the 600MHz Infiniium to be useful to maybe 750MHz but not much beyond that. |
| ARF:
Your comment was correct. UDMA-66+ can work correctly only with 80-pin IDE cable. But if LS-120drive is connected with 80-pin IDE cable IDE bus will work incorrectly or will slow speed to UDMA-33. It'll happen because old controller was used and it can't work faster. Therefore that there is only one way to plug correctly System HDD with speed UDMA-66+. It can be done by switching LS-120drive to secondary IDE chanel with CD-drive. In this case only system HDD will be connected with first chanel IDE. Second chanel IDE will have connection MASTER DEVICE - CD-drive , SLAVE DEVICE will be LS120drive. A picture of my connection of IDE-devices in my oscilloscope is below. 40-pin cable is conncted with LS-120 device and LS-120 device is connected with CD. I wrote to blacknoise about custom firmware for Agilent HP 54831D. I hope he's on the forum from time to time and he'll reply to me. |
| Howardlong:
--- Quote from: Wuerstchenhund on November 20, 2015, 05:24:14 pm --- --- Quote from: Howardlong on November 20, 2015, 04:17:14 pm ---When running in equivalent time, this 600MHz scope has a bandwidth well over 1GHz, and about 850MHz in real time. --- End quote --- Not sure I can follow you here. Aside from the fact that 4GSa/s should be absolutely sufficient for resolving 1GHz signals, the scope still has a 600MHz front end through which all input signals must pass, and which has a frequency response that is completely independent of the type of sampling used. I'd expect the 600MHz Infiniium to be useful to maybe 750MHz but not much beyond that. --- End quote --- Take a look at this video from about 23:08, if you want more context look further back, but it's figured out from a measured 44ps step input based on a flat response. If you assume a Gaussian response then it's about 1.2GHz in equivalent time and 750MHz in real time. From the overshoot, I am assuming the scope is predominantly a flat response rather than Gaussian for anti aliasing. Either way I' d be interested in your view, or other experiments I could make: I didn't try the RF signal generator for example. http://youtu.be/mS3sCJd_GPk |
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