USB 2.0 Harici Harddiskte Hız Sorunu

[Muhip Tezcan]

Merhabalar 
Geçenlerde Western Digital 250GB My Book Essential
harici harddisk aldým. Baðladýðýmda harddiski görüyor
onda bir sorun yok fakat alet genelde çok yavaþ
çalýþýyor. Hangi porttan baðlarsam baðlayayým EHCI
yerine OHCI controller'ý devreye giriyor ve alet 480M
yerine 12M'de çalýþýyor. Ancak bir iki sefer
bilgisayarý yeniden baþlattýðýmda 480M ile baðlandý.
Bunun için usb fareyi ve diskin usb baðlantýsýný
çýkardým, bilgisayarý öyle baþlattým ve baþladýktan
sonra diski taktým. Fakat bugün aynýsýný yapmama
raðmen yine 12M olarak görüyor. Neden olabilir? Her
seferinde yüksek hýzda çalýþmasýný nasýl
saðlayabilirim? 
Usbtree çýktýsý þöyle:

/:  Bus 04.Port 1: Dev 1, Class=root_hub,
Driver=ohci_hcd/2p, 12M 
/:  Bus 03.Port 1: Dev 1, Class=root_hub,
Driver=ohci_hcd/2p, 12M 
    |__ Port 1: Dev 9, If 0, Class=stor.,
Driver=usb-storage, 12M 
/:  Bus 02.Port 1: Dev 1, Class=root_hub,
Driver=ohci_hcd/2p, 12M 
    |__ Port 1: Dev 3, If 0, Class=HID, Driver=usbhid,
1.5M 
/:  Bus 01.Port 1: Dev 1, Class=root_hub,
Driver=ehci_hcd/6p, 480M 


dmesg çýktýsý ise þöyle:

usb 3-1: new full speed USB device using ohci_hcd and
address 9 
usb 3-1: not running at top speed; connect to a high
speed hub 
usb 3-1: new device found, idVendor=1058,
idProduct=0901 
usb 3-1: new device strings: Mfr=1, Product=2,
SerialNumber=3 
usb 3-1: Product: External HDD 
usb 3-1: Manufacturer: Western Digital 
usb 3-1: SerialNumber: 57442D5743414E4B36373133303631 
usb 3-1: configuration #1 chosen from 1 choice 
scsi8 : SCSI emulation for USB Mass Storage devices 
usb-storage: device found at 9 
usb-storage: waiting for device to settle before
scanning 
  Vendor: WD        Model: 2500JB External   Rev: 0107

  Type:   Direct-Access                      ANSI SCSI
revision: 00 
SCSI device sda: 488397168 512-byte hdwr sectors
(250059 MB) 
sda: Write Protect is off 
sda: Mode Sense: 03 00 00 00 
sda: assuming drive cache: write through 
SCSI device sda: 488397168 512-byte hdwr sectors
(250059 MB) 
sda: Write Protect is off 
sda: Mode Sense: 03 00 00 00 
sda: assuming drive cache: write through 
 sda: sda1 
sd 8:0:0:0: Attached scsi disk sda 
usb-storage: device scan complete


 
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