USB hdd-funguje jen v jednom portu
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USB hdd-funguje jen v jednom portu
PS: bratr ma stejny notebook a podobny hdd (mensi kapacita 120 GB) a pred mesicem se mu prestal roztacel na jednom usb portu. Musi ho davat do jineho. Ze by neco postupne odchazelo?
Moje otazka zni: Kde sezenu nahradni kabel (56 cm) k tomuto disku?
Da se nejak vyresit aby fungoval ve vsech usb portech? Co ten jak nekdy funguje a nekdy ne? Da se to opraveit? Je zrejme trosku vyviklany, ale jak pisu vyse, mys v nem chodi bez zaseku-hdd se nekdy neprobudi nebo neroztoci.
Dekuji za odpoved.
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AmarokCZ
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PS: mozna bude smejd i ten NTB a jeho usb (mozna privody k usb konektorum) jako je to nekdy s nekvalitnimi kabely u stolnich pc u prednich USB konektoru.
Jinak diky za reakce.
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AmarokCZ
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Hypnos: abych tady neřešil blbost, tak: pokud jde disk jen v některé USB zásuvce, tak je na 100% problém v NTB, řešením je buď USB HUB s odděleným napájením nebo USB kabel který se připojuje na 2 USB. Krátký kabel ... http://www.czechcomputer.cz/product.jsp?artno=64615 je ale otázka, zda má dostatečně dimenzované vodiče.
Já tam vidím tohle:
7.2.1 Classes of Devices
The power source and sink requirements of different device classes can be simplified with the introduction of the
concept of a unit load. A unit load is defined to be 100 mA. The number of unit loads a device can draw is an
absolute maximum, not an average over time. A device may be either low-power at one unit load or high-
power, consuming up to five unit loads. All devices default to low-power. The transition to high-power is under
software control. It is the responsibility of software to ensure adequate power is available before allowing
devices to consume high-power.
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AmarokCZ
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EDIT:
7.2.1.2.1 Over-current Protection
The host and all self-powered hubs must implement over-current protection for safety reasons, and the hub must
have a way to detect the over-current condition and report it to the USB software. Should the aggregate current
drawn by a gang of downstream facing ports exceed a preset value, the over-current protection circuit removes
or reduces power from all affected downstream facing ports. The over-current condition is reported through the
hub to Host Controller, as described in Section 11.12.5. The preset value cannot exceed 5.0 A and must be
sufficiently above the maximum allowable port current such that transient currents (e.g., during power up or
dynamic attach or reconfiguration) do not trip the over-current protector. If an over-current condition occurs on
any port, subsequent operation of the USB is not guaranteed, and once the condition is removed, it may be
necessary to reinitialize the bus as would be done upon power-up. The over-current limiting mechanism must be
resettable without user mechanical intervention. Polymeric PTCs and solid-state switches are examples of
methods, which can be used for over-current limiting.