Andre Hedrick
The Linux IDE guy
On Sat, 30 Oct 1999, Steve Snyder wrote:
> I'm running Linux v2.2.13 on a Compaq Presario 1260. This machine has a
> Fujitsu hard disk, model MHC2040AT. Linux says that the disk has 0KB
> cache, Fujitsu says it has a 512KB buffer. What's going on here?
>
> According to Fujitsu:
>
> http://www.fcpa.com/cgi-bin/goFrames.cgi/product/hd/hd_mhc2040at_spec.html
>
> According to Linux:
>
> OPTI621X: IDE controller on PCI bus 00 dev a0
> OPTI621X: not 100% native mode: will probe irqs later
> ide0: BM-DMA at 0xfcf0-0xfcf7, BIOS settings: hda:pio, hdb:pio
> ide1: BM-DMA at 0xfcf8-0xfcff, BIOS settings: hdc:pio, hdd:pio
> hda: FUJITSU MHC2040AT, ATA DISK drive
> hdc: TOSHIBA CD-ROM XM-1802B, ATAPI CDROM drive
> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> ide1 at 0x170-0x177,0x376 on irq 15
> hda: FUJITSU MHC2040AT, 3909MB w/0kB Cache, CHS=993/128/63
>
> Some additional info:
>
> # /sbin/hdparm -i /dev/hda
>
> /dev/hda:
>
> Model=FUJITSU MHC2040AT, FwRev=0818, SerialNo=01124560
> Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
> RawCHS=7944/16/63, TrkSize=0, SectSize=0, ECCbytes=4
> BuffType=0(?), BuffSize=0kB, MaxMultSect=16, MultSect=16
> DblWordIO=no, maxPIO=2(fast), DMA=yes, maxDMA=0(slow)
> CurCHS=993/128/63, CurSects=796917882, LBA=yes, LBAsects=8007552
> tDMA={min:120,rec:120}, DMA modes: mword0 mword1 *mword2
> IORDY=yes, tPIO={min:240,w/IORDY:120}, PIO modes: mode3 mode4
>
> So...
>
> 1. Is there a distinction between the "buffer" size referenced by Fujitsu
> and the "cache" size reported by Linux?
>
> 2. If in fact this disk has an onboard buffer, how can I enable it?
>
> Thank you.
> *** Steve Snyder ***
>
>
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