{"id":221,"date":"2006-01-20T10:50:00","date_gmt":"2006-01-20T10:50:00","guid":{"rendered":"http:\/\/markwilson.me.uk\/blog\/2006\/01\/checking-how-much-power-usb-device.htm"},"modified":"2007-03-16T10:28:14","modified_gmt":"2007-03-16T10:28:14","slug":"checking-how-much-power-usb-device","status":"publish","type":"post","link":"https:\/\/www.markwilson.co.uk\/blog\/2006\/01\/checking-how-much-power-usb-device.htm","title":{"rendered":"Checking how much power a USB device requires"},"content":{"rendered":"<p><!--113775593989990991-->I have a number of <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2004\/10\/ultra-portable-external-storage.htm\">USB-attached hard disks<\/a> that I use for portable mass storage, backups, etc. Very occasionally, Windows XP will report that there has been a power surge on the <a href=\"http:\/\/en.wikipedia.org\/wiki\/Universal_Serial_Bus\">USB<\/a> port and that it has been shut down. This can happen when the total number of devices attached to a USB hub (internal or external) exceeds the total power available. I&#8217;ve always treated that as a minor annoyance (and as these disks have two USB connections and a Y-shaped cable, I can simply use two ports) but then a few days back I noticed something I&#8217;ve never see before &#8211; the ability to view power details for (or more precisely current drawn through) a USB root hub:<\/p>\n<p><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.markwilson.co.uk\/blog\/images\/usbpower.gif?w=700&#038;ssl=1\" alt=\"USB device power draw\" border=\"0\" \/><\/p>\n<p>As can be seen in the example above, my scanner is using the full 500mA on its port, but there is still a port available which could potentially provide another 500mA. To view this information, open Device Manager from the Computer Management MMC snap-in and expand the Universal Serial Bus Controllers node. There will normally be a number of controllers listed, along with some devices and USB root hubs. Each USB root hub should have include power details within its properties.<\/p>\n<p>Checking my <a href=\"http:\/\/en.wikipedia.org\/wiki\/FireWire\">IEEE 1394<\/a> (FireWire\/i.Link) controller doesn&#8217;t seem to offer the same facilities, presumably because it doesn&#8217;t have the same concept of a root hub.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I have a number of USB-attached hard disks that I use for portable mass storage, backups, etc. Very occasionally, Windows XP will report that there has been a power surge on the USB port and that it has been shut down. This can happen when the total number of devices attached to a USB hub &hellip; <a href=\"https:\/\/www.markwilson.co.uk\/blog\/2006\/01\/checking-how-much-power-usb-device.htm\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Checking how much power a USB device requires<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[33,32],"class_list":["post-221","post","type-post","status-publish","format-standard","hentry","tag-windows","tag-pc-hardware"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Checking how much power a USB device requires - markwilson.it<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.markwilson.co.uk\/blog\/2006\/01\/checking-how-much-power-usb-device.htm\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Checking how much power a USB device requires - markwilson.it\" \/>\n<meta property=\"og:description\" content=\"I have a number of USB-attached hard disks that I use for portable mass storage, backups, etc. Very occasionally, Windows XP will report that there has been a power surge on the USB port and that it has been shut down. This can happen when the total number of devices attached to a USB hub &hellip; Continue reading Checking how much power a USB device requires\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.markwilson.co.uk\/blog\/2006\/01\/checking-how-much-power-usb-device.htm\" \/>\n<meta property=\"og:site_name\" content=\"markwilson.it\" \/>\n<meta property=\"article:published_time\" content=\"2006-01-20T10:50:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2007-03-16T10:28:14+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.markwilson.co.uk\/blog\/images\/usbpower.gif\" \/>\n<meta name=\"author\" content=\"Mark Wilson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@markwilsonit\" \/>\n<meta name=\"twitter:site\" content=\"@markwilsonit\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Mark Wilson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/01\\\/checking-how-much-power-usb-device.htm#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/01\\\/checking-how-much-power-usb-device.htm\"},\"author\":{\"name\":\"Mark Wilson\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#\\\/schema\\\/person\\\/98f61365e7c39d6be942174b8c4de468\"},\"headline\":\"Checking how much power a USB device requires\",\"datePublished\":\"2006-01-20T10:50:00+00:00\",\"dateModified\":\"2007-03-16T10:28:14+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/01\\\/checking-how-much-power-usb-device.htm\"},\"wordCount\":239,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#\\\/schema\\\/person\\\/98f61365e7c39d6be942174b8c4de468\"},\"image\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/01\\\/checking-how-much-power-usb-device.htm#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/images\\\/usbpower.gif\",\"keywords\":[\"Microsoft Windows\",\"PC Hardware\"],\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/01\\\/checking-how-much-power-usb-device.htm#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/01\\\/checking-how-much-power-usb-device.htm\",\"url\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/01\\\/checking-how-much-power-usb-device.htm\",\"name\":\"Checking how much power a USB device requires - markwilson.it\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/01\\\/checking-how-much-power-usb-device.htm#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/01\\\/checking-how-much-power-usb-device.htm#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/images\\\/usbpower.gif\",\"datePublished\":\"2006-01-20T10:50:00+00:00\",\"dateModified\":\"2007-03-16T10:28:14+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/01\\\/checking-how-much-power-usb-device.htm#breadcrumb\"},\"inLanguage\":\"en-GB\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/01\\\/checking-how-much-power-usb-device.htm\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-GB\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/01\\\/checking-how-much-power-usb-device.htm#primaryimage\",\"url\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/images\\\/usbpower.gif\",\"contentUrl\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/images\\\/usbpower.gif\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/2006\\\/01\\\/checking-how-much-power-usb-device.htm#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Checking how much power a USB device requires\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/#website\",\"url\":\"https:\\\/\\\/www.markwilson.co.uk\\\/blog\\\/\",\"name\":\"markwilson.it\",\"description\":\"get-info -class technology | write-output &gt; 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