What is the block (sector) size of various cloud storage providers? [closed]

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http://serverfault.com – I'm testing various cloud providers and see that some calculate the space needed for 1,000 favorite files differently than for 1,000 larger files. Is there any online resource that lists or compares the logical block size of these (or similar) providers: SkyDrive Dropbox Egnyte Google storage Amazon (Please ignore Amazon if they only have an API that relies on S3 storage, since I believe it's the developer who uses S3 that ultimately figures out the block/sector size) (HowTos)