\nConsider the following sequence of operations, assuming that F: is a\nUSB thumb drive with plenty of disk space.\n<\/p>\n
\nC:\\Users\\Bob\\Downloads> copy readme.txt F:\\\n 1 file(s) copied.\nC:\\Users\\Bob\\Downloads> copy Update.iso F:\\\nThe parameter is incorrect.\n<\/pre>\n\nWhy is the second file copy failing?\n<\/p>\n
\nThe hint is the file extension: *.iso, which suggests that this\nis a CD or DVD image, and DVD images have the feature that they\ntend to be really big.\n<\/p>\n
\nLike more than\n4GB<\/a>\nbig.\n<\/p>\n
\nUSB thumb drives tend to be formatted with the FAT32 file system\nrather than\n\nwith NTFS<\/a>.\nAnd\n\nFAT32 has a maximum file size of 4GB minus one byte<\/a>.\n<\/p>\n
\nThe user confirmed that the
Update.iso<\/code> file was\nlarger than 4GB and that the USB thumb drive was formatted as FAT32.\n<\/p>\n\nMind you, the error message doesn’t help at all in identifying\nthat this is what’s going on.\nI don’t know where it’s coming from, but my guess is that\nsomewhere inside the
copy<\/code> command, it tries to create\nthe destination file and set its file size.\nSince the file size is out of range for FAT32, the call fails\nwith the errorERROR_INVALID_PARAMETER<\/code>,\nand that’s what ends up bubbling out to the user.\n<\/p>\n\nBut at least now you know what the confusing error message is trying\nto tell you.<\/p>\n","protected":false},"excerpt":{"rendered":"
Consider the following sequence of operations, assuming that F: is a USB thumb drive with plenty of disk space. C:\\Users\\Bob\\Downloads> copy readme.txt F:\\ 1 file(s) copied. C:\\Users\\Bob\\Downloads> copy Update.iso F:\\ The parameter is incorrect. Why is the second file copy failing? The hint is the file extension: *.iso, which suggests that this is a CD […]<\/p>\n","protected":false},"author":1069,"featured_media":111744,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[104],"class_list":["post-9423","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oldnewthing","tag-tipssupport"],"acf":[],"blog_post_summary":"
Consider the following sequence of operations, assuming that F: is a USB thumb drive with plenty of disk space. C:\\Users\\Bob\\Downloads> copy readme.txt F:\\ 1 file(s) copied. C:\\Users\\Bob\\Downloads> copy Update.iso F:\\ The parameter is incorrect. Why is the second file copy failing? The hint is the file extension: *.iso, which suggests that this is a CD […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/9423","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/users\/1069"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/comments?post=9423"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/9423\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/media\/111744"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/media?parent=9423"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/categories?post=9423"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/tags?post=9423"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}