A series of tests indicates that the FC1307A is able to sustain 24 MB/s6, and although there are no real benchmarks of the JM20330 by name, there is a claim that it can hit 30 MB/s with a hard disk drive7. This still doesn’t explain the slowdown because that’s six times the transfer rate benchmarked5.Īnd individually, neither chip is slow. On the device side it supports SDHC 2.0, which allows cards to run at 25 MB/s. The FC1307A appears to support UDMA 6 on the host side, the same as the JM20330 (though the datasheet only claims ATA/ATAPI-6 compatibility). That shouldn’t be the cause of any slowdowns4. It supports ATA/ATAPI-7 and UDMA 6, giving it a 133 MB/s parallel ATA bus and a 150 MB/s serial ATA bus. SATA was only three years old, and lots of PATA drives were still floating around, so it made sense to produce a bridge that allowed the use of old drives in new systems. The JM20330 was released in 2003 if we go by the datasheet’s publication date. It’s extremely shit and outperformed by an X-25M, but it is technically a SATA SSD. The SD card is converted to PATA which is converted to SATA which does indeed create a SATA SSD. This occurs within the board, hence the large parallel bus visible between the chips. Since CompactFlash cards can run in ATA mode and are essentially tiny PATA SSDs, the two adapters can be chained. The JM20330 is a SATA to PATA bridge, and the FC1307A is a CompactFlash to SD adapter. Here is what they had to say about the performance of the two chip device:Ĭonsulting the datasheets reveal how it works but not why it’s so slow. I found it when I was looking at the SATA-SD adapters on ebay and noticed that it was a two chip implementation using chips I already have. This site had lots of good info about the limits for the different chips used in the adapters. Wipes the floor with them on large transfers because it negotiates functional multi-word DMA. Need to dig up some older SD to find something that is SD limitedĪn old 6.4 GB Quantum Fireball EX holds its own against the small DOMS, IDE/SD and CF adapters because of the 512K onboard cache. I can give hints what I want in the bios, but what gets negotiated can be different.Īll of the SD cards I've used have been limited by the speed of the IDE/SD adapter (Single word UDMA 5). Probably the most important thing for good performance is getting the proper ATA/UDMA/Multiword negotiation. The biggest things I've noted so far are:Ĭompatibility is a lot harder than I expected for new drive & a 15 year old controllers in 25 year old motherboards I'll crack open the DOMs to get controller info I'll play with ATA secure erase to see if I can show that it helps DOMs/SDs or CFs. Had to get out a freedos boot disk to partition the 256GB SSD. Have not been able to get a 44pin laptop module to recognize yet, pins are not labeled, may have fried it by getting pin 1 wrong. ![]() I have a pile of drives to benchmark, from a 1993 Quantum Prodrive (Came back to life after a lot of prodding) to a Crucial M4 SSD SIIG SATA 150 - Currently in a working 440BX box but it is SATA only and i'm not testing that many Sata devices Promise ATA33Ultra - Should arrive this week along with the last DOM I should try it in the 440BX board or return it soon VIA Raid - has no bios / software won't mount single drives / but has great ATA matrix info & Smart reportingĪdaptect Ultra 66 -( ASH-133 w/ SIIG Chipset ) - I have not had this work anywhere yet. XT IDE - Have to take some time to get the jumpers & bios right so it works on AT class I have a couple IDE controllers I hope to get to but. Matrox 150 ( Looks like a Paradise 150Tx2 but with different bios, locks up on boot with my 486 motherboards) ![]() Paradise 100TX2 (Doesn't detect drives on my 486 motherboards) I'm testing where I can with these IDE controllers -īarebones ISA IDE that came with a CD ROM - I call it "the Gimp". I can add results from a 386sx20, 486dx33VLB and a Celeron 800, but my testing desk only has space for 2 setups right now and getting those things stable takes time. P5I430TX TITANIUM IB+ w/ Cyrix MII 300+ ( Rev J bios supports up to 128GB, love it) Gateway BAT4IP3 (420EX) w/ Amd 5x86-WB 133+ (Bios supports 2GB drives, but turns to stone if it sees > 2GB, EZ overlay works with 2GB config if I keep the partitions under 8GB, gotta get a better bios ) ![]() I selected 2 motherboards to bench with right now: ![]() I'd like to eventually bench mark something real-world I/O bound like boot time or scripted install time. I have been benchmarking with ATTO under Win98SE. I'm putting together a spreadsheet of my results.
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