cemal gurel

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About cemal gurel

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  1. cemal gurel

    Western Digital Raptor WD1500

    Hi again, I have a typing problem for the Sil0680ACL144 chip. The chip I have on Digitus PATA RAID controller is not from 'Silicon Integrated Systems', it is by 'Silicon Image!' Sorry, for that! I know the therotical limits of both PATA 133 and SATA 150 and Sata 300. For high bandwith, SATA is good to use on 9xx chipsets by Intel. With 8xx chipset, SATA has NO significant advantage! I have given a comparison with 1xWDC 1500 Raptor and 2xWDC2500SB by saying 2x expensive but 1,5 times slower! And also, 1xWDC 1500 Raptor is not faster compared with a basic RAID system with 2x80GB 2x2MB cache by any kind of current market drive, but 4x expensive including the RAID card! Another problem of so called 10000rpm drives by any kind of manutacturer(s) including SCSI ones, is the diameter of the 'inside disc' problem. WDC1500 Raptor's discs are SMALLER than 7200rpm desktop drive disks! That makes, run over exterior disk surface 'speed on pass' problem, which means, 10000 / 7200 = 1,38 - lower disk diameter = about 1,2 times maximum only actual rotational difference! It causes storage decrease + 1 head more for same storage cost by the manufacturer, (so we are paying for the extra cost!). Why not making them by same 7200rpm disks? are a technical problem. This makes 10000rpm drives roughly 8600rpm drive. Do not forget! Read process starts by the outer side of the disk(s)! We have reached to the end of PATA interface on 133MB's. NEWER drives can not give SO MUCH Brilliant performance because eventually there is no higer transfer rate than the actual limit of 120MB's by ATA133 controller and this effects average read performance negatively! I want to add one more thing, WDC1500 Raptor is designed for desktops but NOT for 7/24 critical NEARLINE usage. One can make a RAID chain by WDC1500 Raptor, but the 7/24 drives has bios support for every 7 seconds write check. SB and JB drives has not much phisycal difference actually. I have examined one WDC1200JB with WDC2500SB and only seen, 1 single capacitor extra, on C39 place near the biggest WD70C26 controller chip. So the dependancy work is done by SOFTWARE, rather than the HARDWARE! Probably adding a capacitor to that C39 place and firmware flashing can make a JB, SB drive! Good luck for all, enjoy spinning drives for speed!
  2. cemal gurel

    Western Digital Raptor WD1500

    Hi, Maximum transfer rate of about 81MB/s not much high for me actually! It probably can give upto 60MB/s average read. If we assume that, there is no possibility of RAID for desktop systems, it might be the fastest drive for 'Single Drive' systems for a good fortune of money. But, a basic PATA RAID system by two 80GB 2MB cache 7200 drive, (by Seagate, WDC, Maxtor, Hitachi or Samsung no matter, currently available drives sold at the market!) gives upto 115MB/s maximum and 80MB/s average read for a budget & bargain system. You can get a little more space, with 1,33 faster average read, but half the price of a single 150GB WDC, compared with 2x80GB 2MB cache drives (as I have mentioned, HDD brand is not much important here!) including RAID 133 Card (by Promise, High Point or Silicon Intgrated Systems PCI cards from PATA connection or SATA as well etc.) I mean, it is not so much fast, 4x expensive, not the only solution for a fast desktop. It is a good development with it's shiney window that I must say. (But I prefer mixed color of flashing led's inside the drive! Why not like ordinary 8, 9 or 12cm fans... hopefully guite sooner!) If you really deserve it, it is logical to use them with SATA 300 system with RAID configuration. At that time it may reach maximum transfer rate of over 150MB/s, and average 120MB/s compared with RAID SATA 150 tranfer rate. But, using 2x150GB WDC may probably give maximum %10 performance gain over using it on a RAID SATA 150 system. For some, %10 is very important as you know! Another good thing is MTBF 1.2 Million hours. Actually I have a PATA RAID system on a Digitus PCI RAID Card with Silicon Integrated Systems chip with 2xWDC 2500SB on a PCI bus with MTBF 1 Million hours. I have about 125MB/s maximum transfer rate with 90MB/s average read. NEW drive with RAID configuration is 1,33 faster than my current RAID system, but 0,6/1 of my total capacity with 2x expensive price! I do not want to critize the capacity and the price, everyone knows them. Results are obviously clear. Although, the current speeds are not too big, there is very little time left for PATA drives, SATA 300 is on the New Autoban. Of course sooner or later, it will achieve better results with more speedy future drive units. I think, Windows Vista will really deserve RAID configurations to run marginally between 2006 to 2010 period. I like to see the achievement of HDD units, as well as new software. Hope you all a happy new year with Windows Vista soon....
  3. Hi, When a person needs 7/24 disk performance at home? Well, if you are using eDonkey2000 you certainly will! Because, if you are using an ordinary Seagate 7200rpm 160 or 200GB with 8mb cache you will lost your precious .part and .part.met files if you shut down Windows XP, without first closing EDonkey2000 program. At that time hours and hours of wait for the films, utilities, mp3s etc. will be lost. WDC RE Drives 7~8sec gap for the write check provides, any unsaved or uncompleted data to be saved, expecially for the .part and .part.met files. It doesn't matter if you have a backup power, some Windows updates automatically restarts the Computer without asking for permission. If eDonkey2000 is working, tataaa!... forget about some files of about 20~50 in some cases. It doesn't matter if your system has ECC memory or not. ECC %10~20 provides better safety but not enough for the disk I/O intensive server class work. I am using 850E chipset with 2GB ECC memory with 250GB WDC RE drive and now I am fine with it. eDonkey2000 needs at least 1GB of Ram it your downloads list has more than 200 files in rank. Processor power can be 2GHz or more. HT is advisable. 3066HT processor is doing fine for me right now. For those who uses such programs MUST use such 7/24 drives by WDC or Maxtor if you are running your computer 100hours or more for sharing files!
  4. cemal gurel

    Seagate Barracuda 7200.7

    Hi, I have just bought a Seagate ST3160023A and connected it to my Maxtor Ultra ATA/133 controller having the latest Promise bios. (Maxtor Ultra ATA/133 Card is exactly the same controller card produced by Promise, but named as Ultra 133 TX2 by them.) I have seen that the new HDD is really fast... On HDTach 2.61: max read: 61324kps, min read: 26632kps, average read: 46231.9kps, average access time: 14.6ms, CPU use: 5.5% and Read Burst over 80Mb/s On SiSoft Sandra, File System Bench: Drive Index: 36,644kB/s, Buffered Read: 75MB/s, Sequential Read: 55MB/s, Random Read: 8MB/s, Buffered Write: 57MB/s, Sequential Write: 9MB/s and Average Access Time: 7ms. I have FAT32 formatted the drive with single 160GB partition, loaded Intel Application Accelerator Rev. on WinME. (I think with Win2000/XP on NTFS the results might be higher.) But the problem is: The drive can not boot with Promise chip! I have a WD1200JB and it can manage to boot with my Maxtor's external controller using WD's disc utility program Data Life Guard v.10 on my i820 based Asus P3C-E motherboard. I have used Seagate's latest Disc Wizard utility Ver. 10.36 but no cure... Finally, a good drive but needed to be used as an additional storage with Promise chip based Maxtor Ultra ATA/133 card. I have heard that on Promise Raid chip based controllers the same problem arises too. Be carefull when buying if you have a Promise controller chip on board or an external controller like mine!!! Seashield is also not available back on the unit too. I have seen the shield on SATA based ST3160023AS based units on internet ads. UATA model is loosed that part. Are we convincing to remove the ATA controllers by a brutal force?
  5. cemal gurel

    WD120JB Problems

    I have WD1200JB too with Maxtor ATA 133 card (Exactly the same card of Promise Ultra 133 TX2 card, and I am using my Maxtor card with the newest bios by Promise.) I have once faced with controller disappearance problem. I have unplugged the card and reinstalled it to the same PCI slot. Voila, everything was Okay. I have no any other problem with WD1200JB on my i820 based Asus P3C-E board. But, I have a newer Seagate 3160023A 160GB 8Mb cache HDD now. That HDD refuses to Boot with my Ultra 133 card. I have an old 40GB another Seagate HDD and It refuses to boot too. I have heard that, Seagate has an inner problem with Promise controller cards. The ones that I have heard were Raid 100/133 cards, but normal 100/133 cards have the same problem too. Finally, Do Not expect to use Promise chip based cards with Seagate HDD's as a boot drive. But for additional storage, they works. For WD's please update your controller cards bios, that may help...