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copied!<p>I added a call to <code>window.webkitStorageInfo.requestQuota</code>, and now it works. I can't get why it is necessary, as I started Chrome with the <code>--unlimited-quota-for-files</code> option.</p> <p>Here the working code:</p> <pre><code><!DOCTYPE html> <html> <head> <script> window.requestFileSystem = window.requestFileSystem || window.webkitRequestFileSystem; function onError(e) { console.log('Error', e); } var xhr = new XMLHttpRequest(); xhr.open('GET', 'http://upload.wikimedia.org/wikipedia/fr/2/26/10_francs_Mathieu_1987_F365-28_revers.jpg', true); xhr.responseType = 'blob'; xhr.onload = function(e) { window.webkitStorageInfo.requestQuota(PERSISTENT, 1024*1024, function(grantedBytes) { window.requestFileSystem(PERSISTENT, 1024 * 1024, function(fs) { fs.root.getFile('image.jpg', {create: true}, function(fileEntry) { fileEntry.createWriter(function(writer) { writer.onwrite = function(e) {}; writer.onerror = function(e) {}; var blob = new Blob([xhr.response], {type: 'image/jpeg'}); writer.write(blob); }, function(e) { console.log('Error', e); }); }, function(e) { console.log('Error', e); }); }, function(e) { console.log('Error', e); }); }, function(e) { console.log('Error', e); }); window.requestFileSystem(PERSISTENT, 1024 * 1024, function(fs) { fs.root.getFile('image.jpg', {create: false}, function(fileEntry) { fileEntry.file(function(file) { var reader = new FileReader(); reader.onloadend = function(event) { var img = document.createElement("img"); img.src = event.target.result; document.body.parentNode.insertBefore(img, document.body.nextSibling); }; reader.readAsDataURL(file); }, function(e) { console.log('Error', e); }); }, function(e) { console.log('Error', e); }); }, function(e) { console.log('Error', e); }); }; xhr.send(); </script> </head> <body> </body> </html> </code></pre>

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